CN102444054A - Filter paper for cooling system in wire electrical discharge machining (WEDM) and production method of filter paper - Google Patents
Filter paper for cooling system in wire electrical discharge machining (WEDM) and production method of filter paper Download PDFInfo
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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
The invention belongs to field of papermaking, the cooling system that is specifically related to a kind of line cutting processing is with filter paper and production method thereof
Background technology
along with Development in Machine Industry of China, line cutting technology is because of it is high to the Metal Cutting machining accuracy, high mould, instrument, the Aero-Space etc. of being widely used in of efficient are made manufacture field.Wire EDM is a kind of process of directly utilizing electric energy and heat energy to process; It cuts workpiece as tool-electrode with a wire electrode that is moving; During the line cutting processing; Can produce electric spark, metal fillings, heat, so numerically controlled discharge machine is typically equipped with cooling system processing work is cooled off.Cooling system is made up of cooling fluid, filter, delivery pump etc., and during the line cutting processing, cooling system ejection cooling fluid is to processing work, and the cooling workpiece is taken away metal fillings and heat, makes wire electrode can Yin Wendu not too high and " fracture of wire " phenomenon occurs.The metal fillings granular size that produces during Wire EDM differs, and the only a few diameter is minimum has only 5 μ m, most more than 15 μ m, and these metal fillings liquid that is cooled is taken away and filtered and be retained down through filter, and the cooling fluid that leaches also continues recycle.Filter is most important parts in the cooling system, and filter generally is made up of drum type filter core, the end cap that is fixed on the wire netting inside and outside the filter core and is fixed on filter core two.Filter core in fact is exactly one or more layers filter paper, so in fact the material of filter paper has determined the quality of filter core.
Mainly there are two types of problems in
line cutting of the prior art cooling system with filter paper: first is to use the life-span short, generally is no more than 15 days; Next is to be prone to fade, and black appears in filtered fluid, and the jetting phenomenon is broken through in the filter paper existence.The main cause that these problems occur is the resin poor water resistance in the filter paper, and it is softening that resin takes place in cooling fluid for a long time, and minimal amounts of dissolved has reduced the wet bursting strength and the resistance to water of filter paper, causes filter paper distortion to occur and breaks through phenomenon, and service life is short; Be exactly that the filter paper aperture is excessive in addition, filtering accuracy is not enough, and metal fillings has part to cause filtered fluid black to occur through filter paper
Summary of the invention
technical problem to be solved by this invention is the deficiency that overcomes prior art, provides that a kind of filtering accuracy is higher, the better line cutting processing of intensity cooling system is used filter paper in water.
another object of the present invention provides the production method of the cooling system of above-mentioned line cutting processing with filter paper.
For realizing above-mentioned purpose, the present invention takes following technical scheme:
The cooling system of
a kind of line cutting processing is used filter paper, by weight percentage, comprising: 18 ~ 25% phenolic resins, 0.5 ~ 5% glass fibre, 0.5 ~ 5% polyster fibre, 65 ~ 82% wood pulp fibres.
preferably, said glass fibre be length between 3 ~ 5 millimeters, the ultra-fine fibre glass of diameter between 2 ~ 6 microns.
preferably, the length of said polyster fibre is between 4 ~ 8 millimeters, line density is 1.5 DENIERs.
preferably, said wood pulp fibre is made up of softwood pulp fiber and hardwood pulp fiber, the percentage by weight that said softwood pulp fiber accounts for filter paper is 40 ~ 70%, the percentage by weight that said hardwood pulp fiber accounts for filter paper is 12 ~ 25%.
The production method of
above-mentioned filter paper comprises following operation: slurrying, size mixing, copy paper, oven dry, solid glue and moulding.
The detailed process of aforementioned production method is:
A slurrying:
Polyster fibre and the suitable quantity of water of (1), getting glass fibre, the formula ratio of timber, the formula ratio of formula ratio add in the pulper carries out size degradation; Obtain solid concentration and be 5 ~ 8% fibre stuff, and then in this fibre stuff, add the wet strength agent that accounts for slurry gross weight 0.5 ~ 1% and continue size degradation;
(2), the fibre stuff that will pass through step (1) changes reserve pit over to, in fibre stuff, adds the wet powerful accelerator that accounts for slurry gross weight 0.5 ~ 1%, continues to add water and stirs, and obtains solid concentration and be 3 ~ 4% fibre stuff;
B sizes mixing:
(3), the fibre stuff of step (2) gained is discongested through fluffer, behind the fiberizer defibrination, changing over to sizes mixing the pond and add water sizes mixing again, obtains solid concentration and be 2 ~ 3% paper pulp;
C copies paper:
(4), paper pulp that step (3) is obtained goes into header box and mixes with water, gets into oblique net former then, blots through dehydration, vacuum, forms moisture content and be 70 ~ 75% l Water Paper;
(5), step (4) gained l Water Paper is again through pressing device squeezing, obtains moisture content and be 60 ~ 65% l Water Paper;
The d oven dry:
(6), the l Water Paper of step (5) gained sent in the baking oven of 40 ℃ ~ 135 ℃ of temperature and cures, obtain moisture content and be 2 ~ 3% body paper;
The solid glue of e:
(7), the body paper of step (6) gained soaked stagnate in phenol resin solution, take out again and push, the gluing rate that keeps phenolic resins is dried under 50 ℃ ~ 140 ℃ temperature conditions 18 ~ 25% then, obtains described filter paper semi-finished product;
The f moulding:
After
(8), the filter paper semi-finished product that step (7) is obtained are processed given shape on demand, under 175 ℃ ~ 185 ℃ temperature conditions, continued acquisition filter paper finished product dry 10 ~ 15 minutes.
preferably, said wet strength agent is a daiamid epoxy chloropropane class wet strength agent, said wet powerful accelerator is an anion-polyacrylamide.
preferably, by weight, used phenol resin solution is self-control emulsion type phenol resin composition in the step (7), its prescription is: 100 parts of phenolic resins, 2.5 ~ 15 parts of flexibilizer, 5 ~ 20 parts of emulsifying agents, 300 ~ 500 parts of water.
further, said flexibilizer is polyhydroxy macromolecule flexibilizer, said emulsifying agent is an anionic emulsifier.
Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage:
filter paper of the present invention is main with wood pulp fibre; Be equipped with a certain proportion of glass fibre and polyster fibre, can reduce the maximum diameter of hole and the average pore size of filter paper, improve filtering accuracy greatly; Again because terylene is a chemical synthetic fiber; Intensity is high, therefore makes the bursting strength of filter paper be improved, and is able to the service life of filter paper prolong.Filter paper has been introduced heat cured phenolic resins after soak the gluing that stagnates, has further improved DIMENSIONAL STABILITY, heat-resisting quantity and the resistance to water of filter paper.
The production method of
filter paper of the present invention has simple advantage.
Description of drawings
Fig. 1 is the technological process of production figure of line cutting processing cooling system of the present invention with filter paper.
The specific embodiment
are done further detailed explanation below in conjunction with concrete embodiment to the present invention, but are not limited to these embodiment.
filter paper of the present invention is used to make the filter core of line cutting processing cooling system; Its working medium is 30 ℃ ~ 60 ℃ a line cutting cooling fluid; The chemical composition of cooling fluid mainly contains water and kinds of surface activating agent; Filter paper is mainly used in the impurity such as metal fragment that carry in the filtering cooling fluid, and the maximum pressure that in use need bear reaches 200kPa, therefore requires filter paper that good filtering accuracy, wet bursting strength etc. are arranged.
As shown in Figure 1, filter paper of the present invention is produced as follows:
A slurrying:
Polyster fibre and the suitable quantity of water of (1), getting glass fibre, the formula ratio of timber, the formula ratio of formula ratio add in the pulper carries out size degradation; The degree of size degradation to single fiber; Obtain solid concentration and be 5 ~ 8% fibre stuff, and then in this fibre stuff, add the wet strength agent that accounts for slurry gross weight 0.5 ~ 1% and continue size degradation a period of time (the slurry gross weight refers to not comprise the slurry total amount of water);
Among
the present invention, selecting needle pine and Eucalyptus dives carpentery workshop is the timber of wood pulp fibre, and the softwood pulp fiber accounts for the percentage of filter paper gross weight should be between 40 ~ 70%, and the hardwood pulp fiber accounts for the percentage of filter paper gross weight should be between 12% ~ 25%; The glass fibre of selecting for use is a length at 3 ~ 5 millimeters, diameter is 2 ~ 6 microns ultra-fine fibre glass, and its effect is the aperture that reduces filter paper, improves the filtering accuracy of filter paper; The polyster fibre of selecting for use is that favorable dispersibility, length are the polyster fibre that 4 ~ 8 millimeters, line density are about 1.5 DENIERs, and its effect mainly is the intensity that improves filter paper, also can play the effect that reduces the filter paper aperture, improves filtering accuracy simultaneously.
(2), the fibre stuff that will pass through step (1) change reserve pit over to, in fibre stuff, add the wet powerful accelerator that accounts for slurry gross weight 0.5 ~ 1%, continue to add water and stir, and are made into solid concentration and are 3 ~ 4% fibre stuff; (the slurry gross weight refers to not comprise the slurry total amount of water).
What
wet strength agent of the present invention was selected for use is cationic wet strength agent PPE (daiamid epoxy chloropropane chloropropylene oxide), and what wet powerful accelerator was selected for use is the PAMA that the Hangzhou chemical institute is produced, and model is HBS-4B.Cationic wet strength agent can electrically be adsorbed by the anion wood pulp fibre, and wet powerful accelerator is an anionic, can with CATION wet strength agent generation bonding, when body paper is dry, form crosslinkedly, improve the doing of body paper, wet strength.
Size mixing:
The fibre stuff of
(3), step (2) gained is discongested through deflaker; Again through the double disc refiner defibrination; Make that fiber is fully mixed, cut-out, dispersion, external fibrillation and neat and well spaced after, change this slurry over to the pond of sizing mixing, add water and size mixing; The solid concentration of adjustment slurry is about 2.5%, and acquisition can be copied the paper pulp of paper.
Copy paper:
(4), make the paper pulp of step (3) gained go into header box and add water both are mixed, get into oblique net former then and manufacture paper with pulp into uniform page, again through dehydration, vacuum blots, and forms moisture content and be 70 ~ 75% l Water Paper page or leaf; Slurry concentration (slurry concentration of surfing the Net) between 0.03 ~ 0.05% when tiltedly the net former is shaped, the vacuum of vacuum tank is-0.04MPa.
(5), the l Water Paper of step (4) gained is again through the pressing device squeezing, obtains moisture content and be 60 ~ 65% l Water Paper;
The d oven dry:
(6), the l Water Paper of step (5) gained sent into the baking oven that temperature progressively heats up from 40 ℃ to 135 ℃ cures (baking oven is made up of the special-purpose drying cylinder of more than ten papermaking that temperature increases progressively), make l Water Paper dewatered drying gradually, the acquisition moisture content is 2 ~ 3% body paper;
The solid glue of e:
(7), the body paper of step (6) gained is soaked stagnate in the phenol resin solution of mass concentration 16 ~ 22%; Take out again and push; L Water Paper moisture content after extruding is about about 40%; The gluing rate of phenolic resins is about 18 ~ 25% (refer to account for filter paper dry weight 18 ~ 25%), the gained l Water Paper is sent into the baking oven that temperature progressively heats up from 50 ℃ to 145 ℃ cured then, obtains described filter paper semi-finished product;
in this step, bake out temperature should not surpass 150 ℃, in case the appearance of heat cured phenolic resins is partly solidified, makes the filter paper hardening, occurs cracking phenomena when causing the filter paper processing and forming.
used phenol resin solution is self-control emulsion type phenol resin composition; By weight, its prescription is: 100 parts of phenolic resins, 2.5 ~ 15 parts of polyhydroxy macromolecule flexibilizer, 5 ~ 20 parts of anionic emulsifier, 300 ~ 500 parts of water.Particularly, said polyhydroxy macromolecule flexibilizer is selected polyvinyl alcohol for use, and anionic emulsifier is selected Jinyang board JY-A4 type anion emulsifier for use.This phenol resin solution does not contain organic solvent, and more environmental protection has avoided pure dissolubility phenolic resins in when coating methanol solvate safety problem such as inflammable, explosive, poisonous; Saved the step of solvent recovery simultaneously; Therefore make production safer, practiced thrift equipment investment, reduced production cost.
Moulding:
(8), the filter paper semi-finished product that step (7) is obtained are processed given shape (can curl, cut, fold etc.) on demand; Under 175 ℃ ~ 185 ℃ temperature conditions, continued to cure 10 ~ 15 minutes; This moment, filter paper became sundown by white, obtained the filter paper finished product.Utilize this filter paper finished product further processing and preparing line cutting cooling system use filter core.
Below be to utilize the inventive method to prepare the embodiment of line cutting processing cooling system with filter paper, the performance testing index of each embodiment gained filter paper is following:
Substance: GB/T451.2-2002
Paper sheet thickness: GB/T451.3-2002
Vertical deflection: GB/T2679.3-1996
Bursting strength: GB/T454-2002
Air permeability: GB/T5453-1997
Maximum diameter of hole and average pore size: GB/T2679.14-1996
Embodiment 1
The quantitative 115g/m of body paper over dry
2
, become quantitative 150 g/m of paper over dry
2
The slurry ratio: 60 parts in bleaching needle pine slurry, 30 parts of bleaching Eucalyptus dives wood pulps, 5 parts of ultra-fine fibre glasses, 5 parts of polyster fibres, add 0.8 part of PPE wet strength agent, 0.8 part of wet powerful accelerator HBS-4B in the slurry.22 meters/minute of wet end speed, coating phenolic resins mass concentration 20%, final coating weight 23% (refers to into the phenolic resins percentage composition in the paper, counts by weight: about 30 parts of phenolic resins).Test result is following: become paper air permeability 85L/m
2
.s, maximum diameter of hole 53 μ m, average pore size 34 μ m, wet expansion 0.7%, wet bursting strength 380KPa, filtering accuracy 8 μ m, removal of impurity reaches 99.3%, 29 days service time.
Embodiment 2
The quantitative 120g/m of body paper over dry
2
, become quantitative 160 g/m of paper over dry
2
, wet end furnish: 65 parts in bleaching needle pine slurry, 28 parts of bleaching Eucalyptus dives wood pulps, 3 parts of ultra-fine fibre glasses, 4 parts of polyster fibres, add 0.5 part of PPE wet strength agent, 0.7 part of wet powerful accelerator HBS-4B in the slurry.21 meters/minute of wet end speed, coating phenolic resins mass concentration 18%, final coating weight 20% (refers to into the phenolic resins percentage composition in the paper, counts by weight: about 25 parts of phenolic resins).Test result is following: become paper air permeability 82L/m
2
.s, maximum diameter of hole 51 μ m, average pore size 33 μ m, wet expansion 0.6%, wet bursting strength 420KPa, filtering accuracy 7 μ m, removal of impurity reaches 99.4%, 30 days service time.
Embodiment 3
quantitative 135g/m2 of body paper over dry; Become quantitative 172 g/m2 of paper over dry; Wet end furnish: 68 parts in bleaching needle pine slurry, 25 parts of bleaching Eucalyptus dives wood pulps, 2 parts of ultra-fine fibre glasses, 5 parts of polyster fibres; Add 1 part of PPE wet strength agent in the slurry, 1 part of wet powerful accelerator HBS-4B.20 meters/minute of wet end speed, coating phenolic resins mass concentration 19%, final coating weight 21% (refers to into the phenolic resins percentage composition in the paper, counts by weight: about 27 parts of phenolic resins).Test result is following: become paper air permeability 88L/m
2
.s, maximum diameter of hole 54 μ m, average pore size 32 μ m, wet expansion 0.45%, wet bursting strength 490KPa, filtering accuracy 8 μ m, removal of impurity reaches 99.52%, 34 days service time.
Can find out that from above embodiment the one-tenth paper air permeability of the filter paper that the present invention makes is at 70-90L/m
2
.S between, (△ P=127Pa) maximum diameter of hole 50-55 μ m, average pore size 30-35 μ m, wet expansion≤1%, wet bursting strength>=350KPa, filtering accuracy＜10 μ m, removal of impurity＞99%.
Advantages such as
filter paper of the present invention has good water permeability, filter area is big, the maximum diameter of hole is little, filtering accuracy is high, water-tolerant; Can effectively remove the tiny impurity such as metallic particles in the line cutting cooling fluid; Indeformable in the use, do not expand; Intensity in water is good, the phenomenon that can not occur breaking through jetting He go out Heisui River.Filter applications of the present invention when line cuts coolant circulation system, can be made the wire cutting machine operate as normal, and cutting accuracy is improved, and reduces the loss of cooling fluid effectively.
More than the present invention has been done detailed description; Its purpose is to let the personage that is familiar with this art can understand content of the present invention and implements; Can not limit protection scope of the present invention with this; All equivalences of doing according to spirit of the present invention change or modify, and all should be encompassed in protection scope of the present invention
Claims (9)
1. the cooling system of a line cutting processing is used filter paper, it is characterized in that: by weight percentage, said filter paper comprises: 18 ~ 25% phenolic resins, 0.5 ~ 5% glass fibre, 0.5 ~ 5% polyster fibre, 65 ~ 82% wood pulp fibres.
2. filter paper according to claim 1 is characterized in that: said glass fibre be length between 3 ~ 5 millimeters, the ultra-fine fibre glass of diameter between 2 ~ 6 microns.
3. filter paper according to claim 1 is characterized in that: the length of said polyster fibre is between 4 ~ 8 millimeters, and line density is 1.5 DENIERs.
4. filter paper according to claim 1; It is characterized in that: said wood pulp fibre is made up of softwood pulp fiber and hardwood pulp fiber; The percentage by weight that said softwood pulp fiber accounts for filter paper is 40 ~ 70%, and the percentage by weight that said hardwood pulp fiber accounts for filter paper is 12 ~ 25%.
5. the production method of each described filter paper in the claim 1 ~ 4, it is characterized in that: said production method comprises following operation: slurrying, size mixing, copy paper, oven dry, solid glue and moulding.
6. production method according to claim 5 is characterized in that: the detailed process of said production method is:
A slurrying:
Polyster fibre and the suitable quantity of water of (1), getting glass fibre, the formula ratio of timber, the formula ratio of formula ratio add in the pulper carries out size degradation; Obtain solid concentration and be 5 ~ 8% fibre stuff, and then in this fibre stuff, add the wet strength agent that accounts for slurry gross weight 0.5 ~ 1% and continue size degradation;
(2), the fibre stuff that will pass through step (1) changes reserve pit over to, in fibre stuff, adds the wet powerful accelerator that accounts for slurry gross weight 0.5 ~ 1%, continues to add water and stirs, and obtains solid concentration and be 3 ~ 4% fibre stuff;
B sizes mixing:
(3), the fibre stuff of step (2) gained is discongested through fluffer, behind the fiberizer defibrination, changing over to sizes mixing the pond and add water sizes mixing again, obtains solid concentration and be 2 ~ 3% paper pulp;
C copies paper:
(4), paper pulp that step (3) is obtained goes into header box and mixes with water, gets into oblique net former then, blots through dehydration, vacuum, forms moisture content and be 70 ~ 75% l Water Paper;
(5), step (4) gained l Water Paper is again through pressing device squeezing, obtains moisture content and be 60 ~ 65% l Water Paper;
The d oven dry:
(6), the l Water Paper of step (5) gained sent in the baking oven of 40 ℃ ~ 135 ℃ of temperature and cures, obtain moisture content and be 2 ~ 3% body paper;
The solid glue of e:
(7), the body paper of step (6) gained soaked stagnate in phenol resin solution, take out again and push, the gluing rate that keeps phenolic resins is dried under 50 ℃ ~ 140 ℃ temperature conditions 18 ~ 25% then, obtains described filter paper semi-finished product;
The f moulding:
(8), after filter paper semi-finished product that step (7) is obtained process given shape on demand, under 175 ℃ ~ 185 ℃ temperature conditions, continued acquisition filter paper finished product dry 10 ~ 15 minutes.
7. production method according to claim 6 is characterized in that: said wet strength agent is a daiamid epoxy chloropropane wet strength agent, and said wet powerful accelerator is an anion-polyacrylamide.
8. production method according to claim 6 is characterized in that: by weight, the prescription of said phenol resin solution is: 100 parts of phenolic resins, 2.5 ~ 15 parts of flexibilizer, 5 ~ 20 parts of emulsifying agents, 300 ~ 500 parts of water.
9. production method according to claim 8 is characterized in that: said flexibilizer is polyhydroxy macromolecule flexibilizer, and said emulsifying agent is an anionic emulsifier.
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