CN1257034C - Hot-pressing sintering method and mould for ceramic, carbide porous products - Google Patents
Hot-pressing sintering method and mould for ceramic, carbide porous products Download PDFInfo
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- CN1257034C CN1257034C CN 02134064 CN02134064A CN1257034C CN 1257034 C CN1257034 C CN 1257034C CN 02134064 CN02134064 CN 02134064 CN 02134064 A CN02134064 A CN 02134064A CN 1257034 C CN1257034 C CN 1257034C
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Abstract
The present invention belongs to a hot-pressing sintering method and a mould for ceramics and a carbide porous product. The method of the present invention comprises the steps that firstly, after powder is coldly pressed to be made into a biscuit, the biscuit is coated with a demoulding agent, the biscuit is arranged on each partition plate of the hot-pressing mould, is penetrated into a core rod and is arranged in an upper punching head and a lower punching head; the biscuit is arranged in a hot press to be sintered and formed at the pressure of 10 to 50Mpa and the temperature of 1200 DEG C to 2000 DEG C. the mould comprises a mould sheath, the partition plates, a core rod, the upper punching head and the lower punching head, wherein the partition plates are arranged in a mould cavity. In the present invention, a plurality of hot-pressing moulds with multiple layers are sintered and formed on the hot press. The present invention has the characteristics of difficult impurity carrying in the production process, good product quality, regular shape, one-time hot pressing sintering of more than 100 porous products, low production cost, long service life of the mould, etc., and production efficiency can be enhanced by ten times to more than ten times than that of the background art. Defects of poor product quality, low productivity, high production cost, short service life of the mold, etc. caused by the direct hot pressing sintering of the powder by the background art are overcome.
Description
Technical field
The invention belongs to pottery and CEMENTED CARBIDE PRODUCTION method and adopt the mould of this method, the particularly a kind of hot-pressing sintering method of many goods with holes of single mode multilayer, each layer and mould that this method adopted of adopting.Especially be suitable for the production of pottery and carbide porous blade etc.
Background technology
At present, hot pressing and sintering technique in pottery, the hard metal article production is to adopt the powder that directly adds the goods prescription in mould, be heated to sinter molding under 1200 °～2000 ℃ and the pressure on the hot press indirectly or directly then, the blank after the moulding or again through grinding or through cutting into finished products such as circle, square, triangle, rhombus at 10～50Mpa.This method is owing to adopt Thermocompressed sintering and forming behind the loose powder adding die cavity, both existed and easily brought impurity into, cause quality of item to reduce, existing again can not direct sintering goods with holes, and goods easily and the disadvantage of die cavity adhesion, mold damage, can only produce 1～2 owing to single mode in addition at every turn, thereby have the defective that productivity ratio is low, production cost is high again.
Summary of the invention
The objective of the invention is defective at the background technology existence, research and design is a kind of to adopt more than single mode multilayer, each layer pottery, the hot-pressing sintering method and the mould of carbide porous products, boost productivity and Products Quality to reach, effectively reduce production costs, prolong purposes such as die life.
Solution of the present invention is the pottery or the carbide alloy powder of the need hot pressed sintering that will prepare earlier, cold pressing and make goods biscuit (blank) with holes and again the biscuit layering is packed in the die cavity, separate with dividing plate between layer and the layer, evenly coat releasing agent in the surface of blank and the hole, plug passes the endoporus of blank, upper and lower drift from the upper and lower pressurization simultaneously of die cavity, withdraws from die cavity and plug through the good goods of hot pressed sintering respectively, just makes required pottery and carbide porous products through grinding dressing.Therefore, the inventive method comprises:
A, compacting biscuit: pottery that will prepare or carbide alloy powder are measured on request and are placed conventional pressing mold to be cold-pressed into goods biscuit (blank) with holes, and the intensity that makes biscuit reaches 30～50% of goods final strength, the demoulding, dry back on the biscuit surface and endoporus evenly coat releasing agent, airing is stand-by;
B, releasing agent is also coated on all surfaces that contacts with biscuit on the dividing plate in hot pressing die inner chamber, cored bar hole, plug, behind the airing with the biscuit proper alignment on the dividing plate of each layer, separate with dividing plate between layer and the layer, last layer is also established a dividing plate, simultaneously plug is through in the hole of each dividing plate and biscuit, and the upper and lower drift in the cored bar hole of packing into, make plug that the blank of upper and lower correspondence and dividing plate, drift are connected into one;
C, hot-forming: the mould of the biscuit of will packing into places in the hot press, upper and lower drift is respectively from the upper and lower pressurization simultaneously of die cavity, hot pressed sintering is 30～90 minutes under 10～50Mpa pressure and 1200 °～2000 ℃ temperature, the demoulding after cooling off, goods withdraw from die cavity and plug, grinding dressing again, get product.
Above-mentioned in 1200 °～2000 ℃ temperature ranges hot pressed sintering, its mode of heating both can be direct heating, also can adopt indirect.And described pottery and carbide alloy powder both can contain binding agent, also can not contain binding agent; And dried biscuit both can remove binding agent, also can not remove binding agent.
And the hot pressed sintering that above-mentioned hot-pressing sintering method adopted comprises inside and outside die sleeve and inside cavity with mould, dividing plate and upper and lower drift; Key is also to comprise plug; And the dividing plate and the upper and lower drift of each layer blank (being biscuit) and blank and drift isolation is equipped with the plug hole; Each dividing plate cooperates with the die cavity wall activity and can be along the upper and lower slip of mould intracavity wall, and upper and lower drift is then movable to be placed on the corresponding upper and lower dividing plate, and plug then is connected into one with the blank of upper and lower correspondence and dividing plate, drift.
And described die sleeve is inside and outside die sleeve, and its die cavity both can be the parallelogram die cavity according to article shape, the porous type die cavity that the cylindrical hole of the isolation mutually of also can serving as reasons is formed.And described plug both can be the short plug that is used respectively with each blank, also can be the blank of upper and lower correspondence and dividing plate, the long plug of drift series connection all-in-one-piece; When for long plug, each the plug hole on the dividing plate is through hole.
The present invention is owing to adopt elder generation that raw meal is cold-pressed into biscuit, adopt more than multilayer, each layer hot pressing die again, Thermocompressed sintering and forming on hot press, in sintering process, be difficult for bringing into impurity, can adhesion between blank and die cavity and the blank, one time the hot pressing sintering reaches more than 100 goods such as triangle with holes, quadrangle or circle, and mould can use more than ten times repeatedly.Quality of item is good, profile is neat thereby have, and production cost is low, and productivity ratio can improve characteristics such as ten to tens of times and die life be long than background technology.
Description of drawings
Fig. 1, for structure of the present invention and user mode schematic diagram;
Fig. 2, be the vertical view (A-A view) of Fig. 1;
Fig. 3, be embodiment 2 structures and user mode schematic diagram; Fig. 4 is its vertical view.
Among the figure: 1, outer die casing, 2, interior die sleeve, 3, upper punch, 4, plug, 5, dividing plate, 6, blank, 7, low punch, 8, die cavity.
The specific embodiment
Present embodiment is an example to produce 16.5 * 16.5 * 8.5mm blade with holes:
A, at first with the AI of conventional requirement
2O
3/ SiCw composite powder places pressing mold to be cold-pressed into 16.5 * 16.5 * 18mm biscuit (blank 6), biscuit centre bore φ 6mm, and the BN releasing agent is evenly coated in dry a little back in each biscuit surface and hole, and dry back is stand-by;
B, also evenly coat the BN releasing agent with the contact-making surface of blank 6 and the surface of plug 4 at the inwall of die cavity 8 and dividing plate 5, and airing, after then low punch 7 and base spacer 5 being loaded on the bottom of die cavity 8, put biscuit (being blank 6), dividing plate more successively, insert plug 4 and upper punch 3 at last, present embodiment is put 6 layers of totally 54 biscuits, 7 dividing plate;
C, be placed in the above-mentioned interior die sleeve 2 of loading onto biscuit in the outer die casing 1 after, place in 40 tons of vacuum hotpressing machines, hot pressed sintering is 60 minutes under 35MPa pressure and 1600 °～1680 ℃ temperature, and the demoulding promptly gets hot-pressed product after cooling off then, and these goods are end article through grinding slightly.
Present embodiment outer die casing 1, interior die sleeve 2, upper and lower drift: 3,7, dividing plate 5 and plug 4 all adopt high purity graphite to make, wherein: outer die casing 1, internal diameter φ 100mm, wall thickness 30mm, high 260mm; Interior die sleeve 2 external diameter φ 100mm, die cavity 8 shaft sections 41.0 * 41.0mm, height also are 260mm; Dividing plate 5 and upper and lower drift 3,7 shaft sections are 40.5 * 40.5mm, and plug hole is φ 5.4mm on it, the thick 8mm of each dividing plate, the thick 50mm that is of upper and lower drift; Plug 4 diameter phi 5.2mm, long 270mm.
Present embodiment is an example with the goods of producing φ 16.5 * 8.5:
At first with Si
3N
4Composite powder is colded pressing and is made the biscuit that φ 16.5 * 18mm center bore is φ 6.0mm (blank 6), and totally 42, each die cavity is adorned base separately, and dress base and sintering method and embodiment 1 are together.
The inside and outside footpath of outer die casing 1 in the present embodiment mould, high and in die sleeve 2 external diameter, high all with embodiment 1 together, die cavity 8 present embodiments adopt 7 cylinder hole shape die cavitys that diameter is φ 16.65mm, upper and lower drift 3,7 also respectively is the drift in 7 cored bar holes 4, punch diameter φ 16.5mm, height is 50mm; Dividing plate 5 diameters are φ 16.5mm, thick 8mm, totally 49; Plug bore dia φ 5.4mm; Plug 4 long 270mm, diameter phi 5.2mm.The material of above-mentioned each parts of mould also is high purity graphite.
Claims (5)
1, the hot-pressing sintering method of a kind of pottery, carbide porous products; It is characterized in that this method comprises:
A, compacting biscuit: pottery that will prepare or carbide alloy powder are measured on request and are placed conventional pressing mold to be cold-pressed into goods biscuit with holes, and the intensity that makes biscuit reaches 30～50% of goods final strength, the demoulding, dry back on the biscuit surface and endoporus evenly coat releasing agent, airing is stand-by;
B, releasing agent is also coated on all surfaces that contacts with biscuit on the dividing plate in hot pressing die inner chamber, cored bar hole, plug, behind the airing with the biscuit proper alignment on the dividing plate of each layer, separate with dividing plate between layer and the layer, last layer is also established a dividing plate, simultaneously plug is through in the hole of each dividing plate and biscuit, and the upper and lower drift in the cored bar hole of packing into, make plug that the blank of upper and lower correspondence and dividing plate, drift are connected into one;
C, hot-forming: the mould of the biscuit of will packing into places in the hot press, upper and lower drift is respectively from the upper and lower pressurization simultaneously of die cavity, hot pressed sintering is 30～90 minutes under 10～50MPa pressure and 1200 °～2000 ℃ temperature, the demoulding after cooling off, goods withdraw from die cavity and plug, grinding dressing again, get product.
2, press the hot-pressing sintering method of the described goods with holes of claim 1; It is characterized in that described hot pressed sintering, its mode of heating both can be direct heating, also can adopt indirect.
3, by the hot-pressing sintering method mould therefor of the described goods of claim 1, comprise inside and outside die sleeve and inside cavity, dividing plate and upper and lower drift; It is characterized in that also comprising plug; And the dividing plate and the upper and lower drift of each layer blank and blank and drift isolation is equipped with the plug hole; Each dividing plate cooperates with the die cavity wall activity and can be along the upper and lower slip of mould intracavity wall, and upper and lower drift is then movable to be placed on the corresponding upper and lower dividing plate, and plug then is connected into one with the blank of upper and lower correspondence and dividing plate, drift.
4, by the described mould of claim 3; It is characterized in that described die cavity both can be the parallelogram die cavity according to article shape, the porous type die cavity that the cylindrical hole of the isolation mutually of also can serving as reasons is formed.
5, by the described mould of claim 4; It is characterized in that described porous type die cavity, when interior die sleeve adopted 7 cylinder hole shape die cavitys, upper and lower drift also respectively was the drift in 7 cored bar holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02134064 CN1257034C (en) | 2002-11-15 | 2002-11-15 | Hot-pressing sintering method and mould for ceramic, carbide porous products |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02134064 CN1257034C (en) | 2002-11-15 | 2002-11-15 | Hot-pressing sintering method and mould for ceramic, carbide porous products |
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| CN1500579A CN1500579A (en) | 2004-06-02 |
| CN1257034C true CN1257034C (en) | 2006-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609862A (en) * | 2014-12-12 | 2015-05-13 | 中国科学院福建物质结构研究所 | Hot-pressing mould and method for preparation of porous structural ceramic |
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| CN102990064B (en) * | 2012-10-26 | 2015-07-15 | 重庆聚能粉末冶金有限公司 | Method for manufacturing motorcycle spring seat |
| CN102941342A (en) * | 2012-12-04 | 2013-02-27 | 郑州机械研究所 | Method for pressing self-brazing agent aluminum welding ring and special cold-pressing die and sintering die thereof |
| CN103707402B (en) * | 2013-11-29 | 2016-03-02 | 浙江恒成硬质合金有限公司 | A kind of pyrophyllite compacting tool set |
| CN104588620B (en) * | 2014-12-26 | 2017-07-04 | 安泰天龙（天津）钨钼科技有限公司 | A kind of preparation method of tungsten copper module |
| CN104690811A (en) * | 2015-03-16 | 2015-06-10 | 中国科学院福建物质结构研究所 | Hot pressing mold easy to de-mold and method for preparing porous structure ceramic by hot pressing mold |
| CN108097960A (en) * | 2018-01-30 | 2018-06-01 | 河南涵信金刚石工具有限公司 | A kind of small dimension carves saw blade hot pressing die |
| CN111072392B (en) * | 2019-11-25 | 2022-07-29 | 宁波江丰热等静压技术有限公司 | Production method of annular ceramic product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609862A (en) * | 2014-12-12 | 2015-05-13 | 中国科学院福建物质结构研究所 | Hot-pressing mould and method for preparation of porous structural ceramic |
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