CN1047953C - Method for manufacturing screen mini-filtering element and its use - Google Patents
Method for manufacturing screen mini-filtering element and its use Download PDFInfo
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- CN1047953C CN1047953C CN96104650A CN96104650A CN1047953C CN 1047953 C CN1047953 C CN 1047953C CN 96104650 A CN96104650 A CN 96104650A CN 96104650 A CN96104650 A CN 96104650A CN 1047953 C CN1047953 C CN 1047953C
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- rolling
- sintering
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- silk screen
- filtering element
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Abstract
The present invention belongs to the fields of filtering elements and manufacturing methods. The filtering element is composed of more than two cross overlapped metal screens formed by presintering, rolling, sintering, cutting to length, pipe winding and welding, wherein sintering technological parameters comprise 1000 to 1350 DEG C of temperature and 1 to 6 hours of time, and rolling technological parameters comprise cool rolling and 10 to 60% of rolling reduction. The filtering element has a pipe type structure formed by a protection screen, a filtering screen and a supporting screen. The filtering element is used for the filtration of a control valve of a servo system. The present invention has the characteristics of narrow distribution of aperture sizes, no blind hole, little circulation resistance, great permeation capability, uniform permeability, high intensity and long service life.
Description
The invention belongs to filter element and method field of manufacturing thereof.---solid, liquid---separating and filtering of solid that mainly is applicable to gas is specially adapted to servo-drive system control valve mini-filtering element.
The servo valve mini-filtering element is the critical component that has important function in the modern industry control system, and it is a key factor that ensures valve body job stability and reliability.Because the servo-control system valve seal cooperates and the requirement of machining accuracy is very high, its circulation aperture is very tiny again, and this hydraulic oil and power gas that enters valve body when just requiring work must be clean, in order to avoid obstruction valve body or influence the switching characteristic of valve body.Though hydraulic oil that uses in the servo-control system and power gas have generally all passed through purified treatment, but consider that the existence of transfer pipeline and encapsulant also can produce various contaminating impurities inevitably in the working environment, therefore further once filtration is set up in the measure of reinforced safety with exactlying again in servo valve body.Consider the restriction of servo valve body inner space, except the reliability of filtering accuracy and the stability of trafficability performance are had the higher requirement, the size of filter element must be very little.In addition, during valve body work, filter element also will bear frequent forward and reverse impact of valve body switching process and higher pressure, also must have good compression strength and impact resistance.
In the prior art, the filter element that is adopted in the servo valve valve body has two kinds: metal powder sintered filter element and wire twine the sintering filter element.
Metal powder sintered filter element adopts bronze or stainless steel powder powder stock usually, forms by compression moulding and sintering.Because powder shape is existing irregular, also have approximate spherical.The filter element that irregularly shaped powder preparation comes out, its pore size filter scope is big, lack of homogeneity; And be similar to not easy-sintering of spherical powder, and cause filter element intensity low, flow resistance is big, and life cycle is short, and simultaneously, powder easily comes off.For this reason, seriously influence the raising of servo valve functional reliability and stability.(" Pollution Control in Hydraulic System " summer unit newly writes).
Though wire winding sintering filter element preferably resolves powder and comes off to the influence of system reliability, but its choked flow is bigger than normal, and owing to can't pressurize during sintering, make its strength and stiffness on the low side, be easy to generate dilatation, this brings certain influence also for the reliability and stability of servo valve control system.(" hydraulic control system " (U.S.) H.E. Merritt).
The object of the present invention is to provide a kind of Manufacturing approach and use of screen mini-filtering element, with the screen mini-filtering element of this method preparation intensity height not only, good reliability, and good stability, precision height.
Screen mini-filtering element of the present invention is to be intersected after the stack by two-layer above woven wire, through presintering, rolling, thermal sintering, be welded; Its version is the tubular structure of being made up of catch net, screen pack and support mesh, and screen pack is between catch net and the support mesh.Wherein catch net shields to screen pack, prevents that screen pack is damaged in rolling or use, selects the bigger plain square net of percent opening usually for use; Screen pack then plays the guarantee effect of filtering accuracy, can select suitable silk screen net type and network No. according to the requirement of filtering accuracy; The effect of support mesh is the strength and stiffness that increase filter element, can select the net type and the network No. of silk screen according to the magnitude of pressure differential that filter element bears.Above-described catch net, screen pack and support mesh all are different metal or the various net types of different grades of steel and silk screens of network No. of selling on the market according to effect separately with selected net type of instructions for use and network No..
The manufacture method of screen mini-filtering element of the present invention is as follows, and at first the operation of this method comprises:
Apolegamy silk screen and definite level---presintering---rolling---sintering---scale cutting---pipe crimping, welding---finished product.
Now that each operation division is as follows:
(1), apolegamy silk screen and definite level
According to filtering accuracy and other instructions for use, select metal species, net type, different silk screens that network No. is all suitable to be used separately as catch net, screen pack and support mesh, and definite level arrangement and quantity;
(2), presintering
Selected silk screen according to determined level, with the stack of each layer silk screen intersection, is put into sintering furnace then and carried out presintering successively, and sintering atmosphere is vacuum or protective atmosphere, and pre-sintering temperature is 1000～1250 ℃, sintering time 1.5～2.5 hours.Its objective is that by diffusion-sintering the fixing position of silk screen longitude and latitude silk circle point prevents silk screen dislocation when rolling;
(3), rolling
Will the superposed metal silk screen after presintering send in the milling train after cooling and be rolled, rolling drafts is 15～55%, with the thickness and the hole permeance property of control silk screen sheet material, and helps the raising of silk screen sintering intensity;
(4), sintering
Silk screen after rolling is put into vacuum or the protective atmosphere sintering furnace carries out sintering, 1100～1300 ℃ of sintering temperatures, sintering time 2.5～5 hours, its purpose obtains higher binding strength between silk screen by diffusion-sintering, makes multi-layer silk screen become the integral body of rigidity;
(5), scale cutting
According to the dimensions of required tube filtering element, the silk screen after rolling is carried out the scale cutting;
(6), batch, weld
The silk screen of scale cutting is rolled into tubulose on rolling machine, adopt vacuum or protective atmosphere to be welded into pipe subsequently, promptly become the servo valve screen mini-filtering element of tubular structure.
By the prepared servo valve screen mini-filtering element of the inventive method, can reach and give index:
(1), filtering accuracy: 5 μ m, 10 μ m, 20 μ m, 40 μ m.
(2), operating pressure: 0.5～31.5MPa.
(3), dimensions: filter core diameter≤Φ 30mm.
Filter core length≤200mm.
(4), fluid permeability (N
2)
2〉=5 * 10
-4L/min.cm
2.Pa.
The screen mini-filtering element that the inventive method is produced is as the filter element of servo-drive system control valve.
Compared with prior art, the present invention has following advantage:
(1), the aperture size narrowly distributing, no blind hole, even pore distribution, circulating resistance is little, the ability that sees through is big.Itself and powder sintered plate permeability are to such as table 1.
(2), the strength and stiffness height, make servo-control system reliable and stable.
(3), back-washable regeneration, long service life.
Table 1 filter element of the present invention and the contrast of powder sintered plate permeability
Embodiment
Manufacture method according to screen mini-filtering element of the present invention has prepared 4 batches of screen mini-filtering elements, and is respectively applied on the servo valve of dissimilar and specification.
The version of 4 batches of screen mini-filtering elements, the selected metal species of each layer silk screen, net type, network No. are as described in Table 2.
According to version, each layer silk screen that each lot number is selected for use intersects stack respectively, carries out vacuum presintering, rolling and vacuum-sintering then in batches, scale cutting subsequently, batches and welds.Presintering, rolling and sintering process parameter is as shown in table 3.The dimensions of final filter element and concrete application and effect are as shown in table 4.The version of table 2 embodiment filter element, the metal species of the selected silk screen of each layer, net type and network No.
| Lot number | Version | The silk net metal kind | Net type network No. | |
| 1 | Two layers | Screen pack | 1Cr18Ni9Ti | Plain weave (MPW) 220# |
| Support mesh | 1Cr18Ni9Ti | Plain weave (MPW) 76# | ||
| 2 | Three layers | Catch net | 304 stainless steels | Plain square net 60 orders |
| Screen pack | 304 stainless steels | Twill (MXW) 850 | ||
| Support mesh | 304 stainless steels | Plain weave (MPW) 76# | ||
| 3 | Three layers | Catch net | The 316L stainless steel | Plain weave (MPW) 76# |
| Screen pack | The 316L stainless steel | Twill (MXW) 1250 | ||
| Support mesh | The 316L stainless steel | Plain weave (MPW) 76# | ||
| 4 | Four layers | Catch net | 1Cr18Ni9Ti | Plain square net 70 orders |
| Screen pack | 1Cr18Ni9Ti | Twill (MPW) 630 | ||
| Support mesh | 1Cr18Ni9Ti | Plain weave (MPW) 76# | ||
| Support mesh | 1Cr18Ni9Ti | Plain weave (MPW) 48# | ||
Presintering, rolling and sintering process parameter in the table 3 embodiment filter element manufacture process
| Lot number | Presintering | Sintering | Rolling | Rolling thickness mm | |||
| Temperature (℃) | Time (hour) | Temperature (℃) | Time (hour) | Rolling mode | Drafts (%) | ||
| 1 | 1000 | 1.5 | 1100 | 4 | Cold rolling | 15 | 0.77 |
| 2 | 1150 | 2 | 1230 | 5 | Cold rolling | 25 | 0.70 |
| 3 | 1200 | 2 | 1280 | 2.5 | Cold rolling | 35 | 0.80 |
| 4 | 1250 | 2.5 | 1300 | 3 | Cold rolling | 55 | 1.20 |
The dimensions performance and the purposes of table 4 embodiment filter element
| Lot number | Specification | Performance | See through ability L/min.cm 2, Pa (compressed air) | Purposes | Precision | |
| Size φ mm | Porosity | Intensity MPa | ||||
| 1 | φ4 | 65％ | 60 | 2.1×10 -2 | Servo valve secret lathe filter core | 40μm |
| 2 | φ5.5 | 53％ | 90 | 4.9×10 -3 | The servo valve filter core | 10μm |
| 3 | φ6.5 | 41％ | 110 | 4.35×10 -3 | The servo valve filter core | 5μm |
| 4 | φ14 | 36％ | 140 | 5.7× -3 | Servo valve prime gas-liquid filteration filter core | 20μm |
Claims (2)
1, a kind of manufacture method of screen mini-filtering element, its operation comprise apolegamy silk screen and definite level, presintering, rolling, sintering, scale cutting, pipe crimping and welding, it is characterized in that:
(1), with selected silk screen, according to determined level, with the stack of each layer silk screen intersection, the sintering furnace of putting into then under vacuum or the protective atmosphere carries out presintering successively, the pre-sintering process parameter is as follows: 1000～1250 ℃ of temperature, 1.5～2.5 hours time;
(2), the silk screen after presintering is rolled after cooling, rolling technological parameter is: cold rolling, and drafts 15～55%;
(3), sintering furnace that the silk screen after rolling is put under vacuum or the protective atmosphere carries out sintering, sintering process parameter is as follows: 1100～1300 ℃ of temperature, 2.5～5 hours time;
(4), according to the dimensions of required tube filtering element, the silk screen after rolling is carried out the scale cutting;
(5), the silk screen of scale cutting is rolled into pipe on rolling machine, under vacuum or protective atmosphere, be welded into pipe subsequently.
2, a kind of screen mini-filtering element by the described manufacture method preparation of claim 1 is characterized in that this filter element is used for servo-control system servo valve filter element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96104650A CN1047953C (en) | 1996-04-29 | 1996-04-29 | Method for manufacturing screen mini-filtering element and its use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96104650A CN1047953C (en) | 1996-04-29 | 1996-04-29 | Method for manufacturing screen mini-filtering element and its use |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1143534A CN1143534A (en) | 1997-02-26 |
| CN1047953C true CN1047953C (en) | 2000-01-05 |
Family
ID=5118417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96104650A Expired - Fee Related CN1047953C (en) | 1996-04-29 | 1996-04-29 | Method for manufacturing screen mini-filtering element and its use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1047953C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620556A (en) * | 2012-05-09 | 2012-08-01 | 河北新特过滤技术有限公司 | Screen sintering furnace and method for screen sintering by using such furnace |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101632886B (en) * | 2009-07-30 | 2011-06-15 | 宁波星箭航天机械厂 | Filtering device for high-pressure gas pipeline |
| CN103418989B (en) * | 2012-05-24 | 2015-08-26 | 中国核动力研究设计院 | A kind of reactor filter assemblies guard preparation method |
| CN104671390A (en) * | 2015-01-19 | 2015-06-03 | 安徽舜禹水务实业有限公司 | External water tank disinfecting instrument |
| CN104827246A (en) * | 2015-04-07 | 2015-08-12 | 新乡市利尔过滤技术有限公司 | High-precision sintering net for filtering |
| CN111991927B (en) * | 2020-07-27 | 2022-08-26 | 西部宝德科技股份有限公司 | Preparation method of high-strength and high-flux sintered metal composite wire mesh |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2085263U (en) * | 1990-11-30 | 1991-09-25 | 张家口市石油机械厂 | Pre-stress screen mesh for mud vibrating screen |
| CN2214629Y (en) * | 1994-12-30 | 1995-12-06 | 戴庆元 | Fume filtering device for domestic evacuating machine |
-
1996
- 1996-04-29 CN CN96104650A patent/CN1047953C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2085263U (en) * | 1990-11-30 | 1991-09-25 | 张家口市石油机械厂 | Pre-stress screen mesh for mud vibrating screen |
| CN2214629Y (en) * | 1994-12-30 | 1995-12-06 | 戴庆元 | Fume filtering device for domestic evacuating machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620556A (en) * | 2012-05-09 | 2012-08-01 | 河北新特过滤技术有限公司 | Screen sintering furnace and method for screen sintering by using such furnace |
| CN102620556B (en) * | 2012-05-09 | 2013-04-03 | 河北新特过滤技术有限公司 | Screen sintering furnace and method for screen sintering by using such furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1143534A (en) | 1997-02-26 |
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Owner name: ANTAI SCIENCE AND TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: GENERAL RESEARCH INST. OF IRON AND STEEL, MINISTRY OF METALLURGICAL INDUSTRY Effective date: 20070914 |
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Effective date of registration: 20070914 Address after: 100081 No. 76 South College Road, Beijing Patentee after: Antai Science and Technology Co., Ltd. Address before: 100081 No. 76 South College Road, Beijing Patentee before: Iron and Steel Central Research Institute of Ministry of Metallurgical Industry |
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Granted publication date: 20000105 Termination date: 20150429 |
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