CN102674841A - Production method of pure carbon seal ring - Google Patents
Production method of pure carbon seal ring Download PDFInfo
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- CN102674841A CN102674841A CN2012101073814A CN201210107381A CN102674841A CN 102674841 A CN102674841 A CN 102674841A CN 2012101073814 A CN2012101073814 A CN 2012101073814A CN 201210107381 A CN201210107381 A CN 201210107381A CN 102674841 A CN102674841 A CN 102674841A
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Abstract
A production method of a pure carbon seal ring includes: compressing power to be compressed into a single blank, namely a raw ring, of a pure carbon graphene seal ring according to shape and structure of the pure carbon seal ring, sintering according to sintering curves, and placing the raw ring in a sealed carbon graphene box for sintering. By the production method, productivity of the pure carbon seal ring is improved, production cycle is shortened, and stability in product quality is improved.
Description
Technical field
The present invention relates to a kind of method of manufacture of pure carbon matter wear ring.
Background technology
1. charcoal-graphite material is a kind of type material, in tightness system, as ceramic ring, carborundum ring to the mill material.Because it has self-lubricating, resistance to wear, high temperature resistant, enough physical strengths are arranged, the coefficient of expansion is low, characteristics such as thermal conductivity height are the best sealing materials of the car combustion engine water pump recycle system.Prior manufacturing method is: with the fine particle powdered carbon, manufacture press-powder through operations such as batching, mixing, roll, abrasive dusts; On the large-tonnage mechanical press, be pressed into square billet or circle base then, put into the stove high temperature sintering; Blank behind the sintering carries out a series of mechanical workouts again.Because self proportion of press-powder powder is low, fine size (325 order),, so that Graphite Powder 99 belongs to non-metallic material is mobile poor, when powder is packed in the die cavity; Press-powder too gently can not look like ceramics powder, and carborundum powder or metal powder are the same, implements automatically and fills up; So die cavity inside often has hole, cause after the product compacting, under the situation with equipressure; The carbon ring that is pressed into, centre have the partial density in space will be lower than the density that the dress real part divides, and cause the density and hardness of whole prod inhomogeneous; In manufacturing processed, make sticker with coal-tar pitch simultaneously, coal-tar pitch is in heat treatment process; Need carry out a series of chemical reaction, make the carbon in the coal-tar pitch convert fixed carbon to, product can produce contraction, crooked, distortion in heat-treatment process; Each dimensional change is big and be difficult to grasp, thereby causes this area to fail to use ceramic ring, the single forming method that uses during carborundum ring is produced.
Conventional sintering program: the raw material of wood-charcoal material is when 400 ° of C are above; Can and airborne oxygen generation oxidizing reaction, form carbon monoxide and dioxide gas and consume, for solving this difficult point; Conventional way is to use a large amount of solid carbon material product wrappings; Make the carbon generation oxidation of airborne oxygen and product outer rim, directly do not contact, and then reach oxidation resistant purpose with product self.Very easily extrusion, and the fixed carbon material became uneven of piling up around the product is even, and to be prone to cause product to be heated inhomogeneous, directly influences quality product.Thereby cause prior manufacturing method to have following shortcoming:
1. the production cycle is long: begin to come out to final product from feeding intake, approximately need 1.5-2 months.Only the high temperature sintering operation just needs 30 days from shove charge, intensification, insulation, cool off, come out of the stove etc.
2. production efficiency is low: traditional conventional working method is that the blank material is processed into the finished product wear ring that meets drawing requirement, and according to existing processing quota, per tour (8 hours) output is 200.
3. the blank utilization ratio is low: blank is processed into finished product, and the blank utilization ratio is low, generally has only about 15%.
4. quality product is inhomogeneous: owing to use coal-tar pitch to make sticker; Contain a large amount of fugitive constituents, uncombined carbon in the pitch; In the process that sintering heats up, pitch begins to soften, volatilize when 80 ° of C; Product produces situation such as contraction, distortion, cracking under the situation of volatilization fusing deliquescing; A large-scale blank will be processed into some wear rings, because the difference of the inside and outside performance of a blank causes the quality of single ring there are differences.
5. contaminate environment is big: in the course of processing, car bits powdered carbon occurs, prevent that powdered carbon from flying upward very difficulty, it is up to standard to cause powdered carbon concentration to be difficult to.
6. manufacturing cost is high: because the production cycle is long, the mode of production falls behind, and causes cost high.
Summary of the invention
Long in order to overcome the above-mentioned production cycle, production efficiency is low, and quality product is inhomogeneous; Problems such as cost of manufacture height; The present invention adopts and earlier press-powder is pressed into single pure carbon matter wear ring stock is raw material ring (to call the raw material ring in the following text), agglomerating method again, thus improve the production efficiency of pure carbon matter wear ring; Shorten the production cycle, improve product stability.
Technical scheme of the present invention is: a kind of method of manufacture of pure carbon matter wear ring may further comprise the steps:
A. carbon graphite powder and other auxiliary materials are processed as press-powder in proportion;
B. according to the shape and the structure of pure carbon matter wear ring, it is the raw material rings that press-powder is pressed into pure carbon matter graphite annulus stock;
C. the raw material ring is carried out sintering;
Press-powder is pressed into the raw material ring may further comprise the steps:
A. according to product drawing, press the compression ratio 3:1 of press-powder compacting front and back, corresponding mould is also made in design;
B. press-powder is injected in the mold cavity, and, makes to reach in the press-powder between interior press-powder of mold cavity and the mold cavity wall not have hole, thereby make the density as pressed in the mold cavity consistent the press-powder compacting of injecting;
C. utilize press that the press-powder powder in the mold cavity is pushed up and down, make press-powder powder density after compacting reach 1.50-1.70g/cm3;
D. after forming the desired shape of drawing, the stock that compacting is taken out in the demoulding is the raw material rings.
Through sorting, the Graphite Powder 99 that the raw material ring is carried separates, and waits to be sintered.
By following roasting curve the raw material ring is carried out sintering and will obtain better sintering effect:
A. pre-heating stage: 150 minutes, temperature rose to 300 ℃ from room temperature evenly;
B. temperature rise period: 550 minutes, temperature rose to 900 ℃ from 300 ℃ evenly;
C. hot stage: sintering temperature remains on 900 ℃ to 1400 ℃ (preferred sintering temperature remains on 900 ℃ to 1100 ℃), and the time was not less than 100 minutes;
D. colling stages: 150 minutes cooling times, make the temperature in the sintering oven drop to room temperature from the sintering high temperature more than 900 ℃ evenly.
Before sintering; Earlier single raw material ring is packed into and protect in the airtight carbon graphite box of container, each raw material ring is in respectively in whole sintering process in the carbon graphite box space, each pure carbon matter wear ring is separated not mutual extrusion, adhesion as sintering; Guarantee that raw material ring heating temperature is even on the one hand; Shrink freely, do not ftracture not flexural deformation after the pitch charing; On the other hand, when pouring in down a chimney into body of heater,, and then stop raw material ring or the pure carbon matter wear ring generation oxidizing reaction in oxygen and the carbon graphite box at first with the carbon graphite box generation oxidizing reaction of splendid attire raw material ring like oxygen.
The carbon graphite box of splendid attire pure carbon matter wear ring successively passes through preheating after getting into burner hearth, heats up, and high temperature and cooling are come out of the stove then.Reduce to room temperature through cooling temperature when coming out of the stove, do not need any protective gloves, can bring out finished product.
In this sintering oven, can not use traditional solid carbon material to carry out oxygen barrier protection, and select ammonia to decomposite inert nitrogen and reducing gas hydrogen as protection.Nitrogen belongs to rare gas element, do not react with oxygen, and hydrogen in air flammable range (20 ℃, 101.325kPa): 4.0～74.5%, LFL lower flammable limit in air (101.325kPa): 570 ℃.The ventage that ammonia decomposes is in the high-temperature zone, and more than 800 °, the hydrogen that therefore feeds burns in body of heater, by the air that advances the carbon graphite tape to go into.The water vapour that produces is discharged body of heater from the burner hearth top.
Beneficial effect: because the present invention has taked above-mentioned compression moulding, realized changing rapidly, continuously manufacturing pure carbon matter graphite-seal ring, overcome the defective of conventional production methods.Concrete data are following:
1) shorten the production cycle significantly:
By 1.5-2 months of the past, shorten to about 14 hours
2) increased substantially production efficiency:
By the past job rate is 200, brings up to 22 of PM compactings, has improved more than 50 times.
3) increased substantially the utilization ratio of material
By past blank processing and utilization rate about 15%, brought up to 100%, realized chipless working.
4) increased substantially the homogeneity of quality product:
The performance ununiformity of single ring, the 20-30% by the past has brought up to below 5%.
5) production environment is improved:
Because product has been realized chipless working, eliminated the discharging of powdered carbon dirt.
6) manufacturing cost reduces significantly: the cost of goods manifactured that adopts the present invention to produce has only 1/2-2/3. of conventional production methods
Two. embodiment:
1. carbon graphite powder and other auxiliary materials are processed as in proportion the formula rate (weight percent) of press-powder:
Prescription one: pitch coke powder 5%-15%; Steady spar ink powder 10%-30%; Sweet natural gas hard(carbon)black 5%-15%; Coal-tar pitch (accounting for the dry powder ratio) 20%-40%; SULPHUR POWDER (accounting for the dry powder ratio) 20%-40%.
Prescription two: pitch coke powder 10%; Steady spar ink powder 20%; Sweet natural gas hard(carbon)black 10%; Coal-tar pitch (accounting for the dry powder ratio) 30%; SULPHUR POWDER (accounting for the dry powder ratio) 30%.
2. design and select special-purpose press
The concrete technical qualification of special-purpose press are following:
1) has: the auto-programming of feeding, eject, releasing;
2) tons gross of press: 10-100 ton;
3) the PM compacting is quantity: 7-30;
4) unit pressure of product: 50-250Mpa
5) pressed density of product: 1.50-1.70g/cm3
6) design and manufacturing particular manufacturing craft.Guarantee the size of product, profile reaches the drawing requirement of finished product.
3. be with the continuous fritting furnace of protective atmosphere
Concrete technical qualification are:
1) the body of heater total length is: 10-50 rice;
2) make protective atmosphere with the ammonia decomposition;
3) total power of continuous oven is 50-300KW;
4) continuous oven has: the preheating zone, add temperate zone, thermal zone and cooling zone;
5) maximum operation (service) temperature is 900--1700C °;
6) every have a point for measuring temperature at a distance from 1-3 rice, and control automatically.
4. the method for tamping: the feeding method of reciprocal roller compaction; After soon powder will push die cavity; With the powder compacting, the press seaming chuck is descended to before pressing through reciprocal drum movement, do not have the space in the powder in the mold cavity and between powder and die cavity wall; The density of press-powder reaches consistent earlier in the whole die cavity, and then product density and hardness after the compacting reach even.
5. in order to prevent that product is squeezed in progradation, manufacture and design carbon graphite box (being called graphite boat again), principal feature is in the graphite box when splendid attire; Layering; Every layer of graphite cake splendid attire space sinks, and be not blank, causes when two-layer graphite cake is stacked together up and down; Levels pure carbon matter wear ring separates, and does not push.The design number of plies of graphite box is according to the furnace mouth size design of sintering oven, and the graphite box is of a size of burner hearth is reserved 10mm-20mm apart from about the burner hearth with the top space, makes things convenient for the discharge of rare gas element and fugitive constituent.This project is according to the size of furnace mouth, and design is 6 layers of graphite cake graphite box of packing into altogether.Total height according to each ring designs and produces graphite cake; The height of overall graphite cake is the height (6mm) of compacting back ring, adds the thickness (5mm) of certain graphite cake bottom, and the position of wherein putting wear ring is a circular hole; Empty, so that wear ring is put to graphite cake.Each graphite annulus has own position, single hole, avoids interconnecting with other graphite annuluss, causes bonding.Can also be designed to 2-3 graphite annulus, be placed in place, same hole from the bottom of one's heart.Must identical faces contact when putting, be out of shape the pressure that is produced during with the minimizing sintering.Each pure carbon matter wear ring is separated.Make left and right sides adhesion, do not push up and down.
Graphite boat indoor design septated hole, a ring is put into a hole, does not touch each other between the raw material ring, in the agglomerating process, maintains the original state, thereby has solved this problem of sintering warpage.
Claims (10)
1. the method for manufacture of a pure carbon matter wear ring may further comprise the steps:
A. carbon graphite powder and other auxiliary materials are processed as press-powder in proportion;
B. according to the shape and the structure of pure carbon matter wear ring, it is the raw material rings that press-powder is pressed into pure carbon matter graphite annulus stock;
C. the raw material ring is carried out sintering.
2. the method for manufacture of a kind of pure carbon matter wear ring according to claim 1 is characterized in that: saidly press-powder is pressed into the raw material ring may further comprise the steps:
A. according to product drawing, press the compression ratio 3:1 of press-powder compacting front and back, corresponding mould is also made in design;
B. press-powder is injected in the mold cavity, and, makes to reach in the press-powder between interior press-powder of mold cavity and the mold cavity wall not have hole, thereby make the density as pressed in the mold cavity consistent the press-powder compacting of injecting;
C. utilize press that the press-powder powder in the mold cavity is pushed up and down, make press-powder powder density after compacting reach 1.50-1.70g/cm3;
D. after forming the desired shape of drawing, the stock that compacting is taken out in the demoulding is the raw material rings.
3. the method for manufacture of a kind of pure carbon matter wear ring according to claim 2 is characterized in that: saidly the raw material ring is carried out sintering by following roasting curve the raw material ring is carried out sintering:
A. pre-heating stage: 150 minutes, temperature rose to 300 ℃ from room temperature evenly;
B. temperature rise period: 550 minutes, temperature rose to 900 ℃ from 300 ℃ evenly;
C. hot stage: sintering temperature remains on 900 ℃ to 1400 ℃, and the time was not less than 100 minutes;
D. colling stages: 150 minutes cooling times, make the temperature in the sintering oven drop to room temperature from the sintering high temperature more than 900 ℃ evenly.
4. the method for manufacture of a kind of pure carbon matter wear ring according to claim 3 is characterized in that said hot stage: sintering temperature remains on 900 ℃ to 1100 ℃, and the time was not less than 100 minutes.
5. according to claim 1; 2, the method for manufacture of 3 or 4 described a kind of pure carbon matter wear rings; It is characterized in that: before sintering, the raw material ring is packed into protect in the airtight carbon graphite box of container earlier, the raw material ring is in whole sintering process in each independent space of carbon graphite box as sintering.
6. the method for manufacture of a kind of pure carbon matter wear ring according to claim 5 is characterized in that: graphite boat indoor design septated hole, a ring is put into a hole, does not touch each other between the raw material ring.
7. the method for manufacture of a kind of pure carbon matter wear ring according to claim 6 is characterized in that: the said formula rate (weight percent) that carbon graphite powder and other auxiliary materials are processed as press-powder in proportion is: pitch coke powder 5%-15%; Steady spar ink powder 10%-30%; Sweet natural gas hard(carbon)black 5%-15%; Coal-tar pitch (accounting for the dry powder ratio) 20%-40%; SULPHUR POWDER (accounting for the dry powder ratio) 20%-40%.
8. the method for manufacture of a kind of pure carbon matter wear ring according to claim 7 is characterized in that: the said formula rate (weight percent) that carbon graphite powder and other auxiliary materials are processed as press-powder in proportion is: pitch coke powder 10%; Steady spar ink powder 20%; Sweet natural gas hard(carbon)black 10%; Coal-tar pitch (accounting for the dry powder ratio) 30%; SULPHUR POWDER (accounting for the dry powder ratio) 30%.
9. according to the method for manufacture of the described a kind of pure carbon matter wear ring of claim 6,7 or 8, it is characterized in that: nitrogen that selection ammonia decomposites in sintering oven and reducing gas hydrogen are as protection.
10. the method for manufacture of a kind of pure carbon matter wear ring according to claim 9 is characterized in that: said method with the press-powder compacting of injecting is after press-powder pushes die cavity, and the reciprocal drum movement of process is with the powder compacting.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101073814A CN102674841A (en) | 2012-04-13 | 2012-04-13 | Production method of pure carbon seal ring |
| CN2013101107355A CN103373851A (en) | 2012-04-13 | 2013-04-01 | Manufacture method of pure-carbon sealing ring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101073814A CN102674841A (en) | 2012-04-13 | 2012-04-13 | Production method of pure carbon seal ring |
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| CN102674841A true CN102674841A (en) | 2012-09-19 |
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| CN2012101073814A Pending CN102674841A (en) | 2012-04-13 | 2012-04-13 | Production method of pure carbon seal ring |
| CN2013101107355A Pending CN103373851A (en) | 2012-04-13 | 2013-04-01 | Manufacture method of pure-carbon sealing ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105948014A (en) * | 2016-04-27 | 2016-09-21 | 山东前昊炭素有限公司 | Coke/sulfonated graphene carbon-graphite material for sealing piece and preparation method thereof |
| CN117447204A (en) * | 2023-12-22 | 2024-01-26 | 成都中超碳素科技有限公司 | Preparation method of mechanical carbon material |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405550A (en) * | 2018-10-19 | 2019-03-01 | 王永兰 | A kind of full-automatic push-down sintering furnace and the single molding production process of carbon graphite ring |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487045A (en) * | 2003-08-04 | 2004-04-07 | 山东烟台石棉制品总厂 | Reinforced sealing asbestos stool plate and its making process |
| CN101481505A (en) * | 2009-01-13 | 2009-07-15 | 宁波东联密封件有限公司 | Molding sintering graphite sealed ring and manufacturing method thereof |
-
2012
- 2012-04-13 CN CN2012101073814A patent/CN102674841A/en active Pending
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2013
- 2013-04-01 CN CN2013101107355A patent/CN103373851A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487045A (en) * | 2003-08-04 | 2004-04-07 | 山东烟台石棉制品总厂 | Reinforced sealing asbestos stool plate and its making process |
| CN101481505A (en) * | 2009-01-13 | 2009-07-15 | 宁波东联密封件有限公司 | Molding sintering graphite sealed ring and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105948014A (en) * | 2016-04-27 | 2016-09-21 | 山东前昊炭素有限公司 | Coke/sulfonated graphene carbon-graphite material for sealing piece and preparation method thereof |
| CN105948014B (en) * | 2016-04-27 | 2018-01-23 | 山东恒煜石墨科技有限公司 | Seal coke/sulfonated graphene carbon graphite material and preparation method thereof |
| CN117447204A (en) * | 2023-12-22 | 2024-01-26 | 成都中超碳素科技有限公司 | Preparation method of mechanical carbon material |
| CN117447204B (en) * | 2023-12-22 | 2024-03-15 | 成都中超碳素科技有限公司 | Preparation method of mechanical carbon material |
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| CN103373851A (en) | 2013-10-30 |
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Application publication date: 20120919 |