CN1172796C - Dry pressing formation type large area ceramic thin sheet demoulding apparatus - Google Patents
Dry pressing formation type large area ceramic thin sheet demoulding apparatus Download PDFInfo
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- CN1172796C CN1172796C CNB021509093A CN02150909A CN1172796C CN 1172796 C CN1172796 C CN 1172796C CN B021509093 A CNB021509093 A CN B021509093A CN 02150909 A CN02150909 A CN 02150909A CN 1172796 C CN1172796 C CN 1172796C
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- elastomeric element
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- die sleeve
- ceramic sheet
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Abstract
The present invention relates to a demoulding device for the large area dry pressing moulding of ceramic sheets, which is characterized in that an elastic component 8 is placed between a cushion block 3 and an upper bunting head 2 of a pressing machine; the section area of the elastic component 8 is slightly smaller than the section area of a moulded ceramic body 6, a part of the elastic component 8 is positioned in a mould sleeve 4, and a natural height exposed out of the mould sleeve 4 is larger than the height of a demoulding block 7; a shape is the same as or similar to the shape of the pressed ceramic sheet; the thickness and the elasticity of the elastic component 8 are adjustable. The elastic component is one of a spongy body, a spring or a hydraulic device or the combination of the spongy body, the spring and the hydraulic device. A demoulding method provided by the present invention is applicable to large area moulding of ceramic sheets (or are called large perimeter/thickness ratio ceramic sheets), and can also be used for the large area cold pressing moulding of plastic powder and metal powder.
Description
Technical field
The present invention relates to a kind of dry-pressing formed stripper apparatus of ceramic sheet that is used for, or rather, relate to a kind of stripper apparatus that is used for large tracts of land (big girth/thickness ratio) potsherd forming process, belong to forming process of ceramics preparation technology field.
Background technology
For a long time, potsherd is a large amount of uses of people and mass-produced object always.In recent years, raising day by day along with scientific and technological level and people's lives demand, large tracts of land thin ceramic sheet (or claiming that big girth/thickness is than potsherd) is widely used, as the micropore thin layer pottery that is used to filter, the thin layer ceramic substrate that is used for integrated circuit is used for the electrolyte of fuel cell and electrode material or the like.Moulding is the first working procedure of the qualified potsherd of processability, and moulding large tracts of land ceramic sheet has kinds of processes.For example slurry casting, rolling formation and dry-pressing formed etc.The solid content of slurry casting moulding is lower, and drying time is long, and shrinks during sintering big.And rolling formation can not obtain given shape, with dry-pressing formed to compare solid content also lower, shrinks big.And dry-pressing formed solid content height shrinks for a short time, and one-shot forming just can obtain the base substrate (circular, square, rectangle etc.) of required form, and is convenient to continuous or semicontinuous production, so dry-pressing formed one of the forming technology the most frequently used in the ceramic industry that is still.But for the ceramic thin plate of big girth/thickness ratio, for example thickness is at 2～3mm, and girth is more than 200mm, and to the utmost is difficulty, does not mentionlet alone bigger girth, even adding additives is also often of no avail sometimes.When key is this large tracts of land ceramic sheet shaping and demoulding, because ceramic sheet is thin, intensity difference own, when the biscuit of moulding up ejects die sleeve, because the frictional force effect that contacts with die sleeve around the biscuit makes its biscuit be subjected to a downward power all around, so in the process of the demoulding, biscuit is subjected to a bending power, thereby is very easy to cause the crack, makes the yield rate of moulding extremely low.
Usually the ceramic dry-pressing formed device that adopts is shown in figure (1).Wherein 1 is the press base, and 2 is the press top end, and 3 is the pressing mold lower cushion block, and 4 is the pressing mold die sleeve, and 5 is the pressing mold upper punch, and 6 is the ceramic powder of moulding to be pressed, and 7 are demoulding piece.
When general ceramic powder was dry-pressing formed, press top end 2 was maintained fixed motionless, and die sleeve 4 and lower cushion block 3 place on the press base 1, and ceramic powder 6 is put into die sleeve 4, add pressing mold upper punch 5.During pressurization, the press base moves up, and causes upper punch 5 to move down relatively, and powder 6 is exerted pressure, and makes it compaction moulding.During the demoulding,, be placed on the press base 1, between press top end and pressing mold die sleeve, put demoulding piece 7 die sleeve, lower cushion block and the whole inversion of pressing mold upper punch.The press base moves up during the demoulding, and with after top end 2 contacts, die sleeve 4 breaks away from owing to being subjected to the demoulding piece 7 power effects on top downwards at demoulding piece 7.After this, the press base moves down again, takes lower cushion block 3 away, thereby takes out molding blank.
The extrusion forming of potsherd all adopts said method to make usually, and this method is used simple, and will there be some problems in easy operating, but for the slim extra-thin potsherd of large tracts of land by the product of this method moulding.
This is because after the potsherd extrusion forming during demoulding, when lower cushion block 3 and forming process of ceramics base substrate 6 are ejected die sleeve 4, produce strong friction between ceramic body 6 and the die sleeve 4, the opposite effect power that causes ceramic body central authorities and be subjected to all around, thereby when ceramic body ejects die sleeve, be easy to cracking, so moulding failure or yield rate are extremely low.And when the potsherd area bigger, during thinner thickness (be big girth/thickness than), this moulding cracking phenomena just is more prone to occur, even it is also of no avail to add binding agent in the ceramic powder.Because for large-area thin plate (sheet), promptly girth/thickness is bigger, more easy to crack than its suffered bending power of big potsherd.
So people have adopted some other method to solve this problem, make it be processed into thin slice etc. by machining as cutting, grinding again as adopting the potsherd of making general thickness earlier.But complex process, cost are too high, can not deal with problems at all.Especially can not solve large tracts of land, promptly girth/thickness is than greater than 100 ceramic sheet (comprising rectangle, the circle etc.) moulding and the difficult problem of the demoulding.The defective that forming process forms in biscuit as micro-crack etc., often with the naked eye is difficult for identification, is difficult in later taking off in binding agent and the sintering process and gets rid of in case exist.So how to guarantee, especially the Forming Quality of large tracts of land base substrate is vital.
Summary of the invention
In order to overcome existing ceramic dry pressing, especially large tracts of land ceramic sheet, the base substrate crack problem that knockout course causes.The objective of the invention is to propose a kind of extrusion forming stripper apparatus, so that very effectively the large tracts of land thin ceramic sheet of ceramic powders extrusion forming is deviate from from mould.
The technical solution adopted for the present invention to solve the technical problems is: described stripper apparatus is characterised in that places an elastomeric element between cushion block and press top end, the sectional area of elastomeric element is slightly less than the sectional area of cushion block, the ceramic sheet shape of its shape and compacting is same or similar, be that ceramic sheet is circular, square, then the elastomeric element cross sectional shape is also corresponding when rectangle or other polygon, only sectional area is smaller, make it to put into die sleeve, the thickness and the elastic force of elastomeric element are adjustable, thickness on the pressure ceramic sheet is decided, thickness more then elastomeric element is higher, vice versa, with prepared ceramic sheet cross section be not subjected to bending power all around and be as the criterion, all be subjected to the power of identical downward direction and no longer be to be subjected to rightabout power in the traditional in the past knockout course.
Described elastomeric element is a kind of or its combination in cavernous body, spring or the hydraulic means; An elastomeric element part places in the die sleeve, and the natural height (promptly compression is highly not preceding) that is exposed at the die sleeve outside should be greater than demoulding tile height.
The dry-pressing formed stripper apparatus of large tracts of land ceramic sheet provided by the present invention can be used for the cold moudling of other materials such as plastic powders, metal dust.
Description of drawings
Fig. 1 is common ceramic sheet material extrusion forming device.
Fig. 2 is that ceramic sheet material of the present invention takes off device.
Fig. 3 is the state of ceramic sheet material stripper apparatus of the present invention when ceramic sheet material is deviate from die sleeve.
Among the figure:
1-press base 2-press top end 3-lower cushion block 4-die sleeve
5-upper punch 6-ceramic body 7-demoulding piece 8-elastomeric element.
The specific embodiment
Stripper apparatus of the present invention as shown in Figure 2.Wherein 1 is the press base, and 2 is the press top end, and 3 is lower cushion block, and 4 is die sleeve, and 5 is upper punch, and 6 is ceramic body, and 7 are demoulding piece.Between lower cushion block 3 and top end 2, put into elastomeric element 8.When the demoulding began, upwards operation of press base 1 drove entire die, and demoulding piece 7 and elastomeric element 8 make progress together, when elastomeric element 8 contacted with press top end 2, elastomeric element began distortion, and the elastic force of concurrent deformation in type ceramic body 6 in die sleeve applies certain pressure.When the further upwards operation of press base, elastomeric element 8 further compressions, until press top end 2 also begins to contact with demoulding piece 7, at this moment die sleeve 4 is to bottom offset, elastomeric element 8 further compressions (and further in type thin slice being exerted pressure), eject die sleeve 4 (see Fig. 3, die sleeve 4 and demoulding piece 7 at this moment can free-fallings usually) until last lower cushion block 3 and forming process of ceramics base substrate 6.At this moment shedding press pressure is removable elastomeric objects 8 and lower cushion block 3, takes out the ceramic body 6 of moulding.In whole knockout course, ceramic body 6 in its surface and all around, all be subjected to the power of equidirectional (downwards), rather than in traditional knockout course, be subjected to rightabout power, therefore the surface of ceramic body can not be subjected to bending power, so can not ftracture after the demoulding, yield rate improves greatly, almost reach 100%.
Large tracts of land stripper apparatus provided by the invention is particularly suitable for the moulding of large tracts of land thin ceramic thin slice, also can be used for slim other material of large tracts of land such as plastics, the cold moudling of metal-powder.
Claims (5)
1, a kind of dry-pressing formed stripper apparatus of large tracts of land ceramic sheet that is used for, comprise press base (1), press top end (2), lower cushion block (3), die sleeve (4), upper punch (5), ceramic body (6), demoulding piece (7), lower cushion block (3), base substrate (6) and upper punch (5) are positioned at die sleeve (4) successively, demoulding piece (7) is placed on the top of die sleeve (4), it is characterized in that:
1. place an elastomeric element (8) between cushion block (3) and the press top end (2);
2. the sectional area of elastomeric element (8) is slightly less than the sectional area of the ceramic body (6) of moulding, and its part is positioned at die sleeve (4), is exposed at the height of the natural height of die sleeve (4) outside greater than demoulding piece (7); The shape of its shape and press ceramic thin slice is same or similar.
2,, it is characterized in that elastomeric element (8) is a kind of or its combination in cavernous body, spring or the hydraulic means by the described dry-pressing formed stripper apparatus of large tracts of land ceramic sheet that is used for of claim 1.
3, by the described dry-pressing formed stripper apparatus of large tracts of land ceramic sheet that is used for of claim 1, it is characterized in that the thickness of elastomeric element (8) and elastic force are adjustable, decide on the thickness of pressure ceramic sheet; Thickness is bigger, and then elastomeric element is higher; Vice versa.
4,, it is characterized in that the elastomeric element shape comprises a kind of or its combination in circle, the square or polygon by the described dry-pressing formed stripper apparatus of large tracts of land ceramic sheet that is used for of claim 1.
5, by the described dry-pressing formed stripper apparatus of large tracts of land ceramic sheet that is used for of claim 1, be used for the cold moudling of large-area plastic powders, metal dust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021509093A CN1172796C (en) | 2002-11-28 | 2002-11-28 | Dry pressing formation type large area ceramic thin sheet demoulding apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021509093A CN1172796C (en) | 2002-11-28 | 2002-11-28 | Dry pressing formation type large area ceramic thin sheet demoulding apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1418769A CN1418769A (en) | 2003-05-21 |
| CN1172796C true CN1172796C (en) | 2004-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021509093A Expired - Fee Related CN1172796C (en) | 2002-11-28 | 2002-11-28 | Dry pressing formation type large area ceramic thin sheet demoulding apparatus |
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| CN (1) | CN1172796C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102233608B (en) * | 2010-04-29 | 2015-05-06 | 上海电气钠硫储能技术有限公司 | Tool piece for multistation isostatic pressing, and application of tool piece |
| CN102371616B (en) * | 2011-08-16 | 2013-10-30 | 武汉凡谷电子技术股份有限公司 | Ceramic body dry-pressing and forming process |
| CN102294483B (en) * | 2011-09-06 | 2012-12-05 | 西北有色金属研究院 | Demoulding method for powder cold-press formed pipe blank |
| CN103072189A (en) * | 2011-11-18 | 2013-05-01 | 常熟市创新陶瓷有限公司 | Ceramic dry pressing mold |
| CN102632542B (en) * | 2012-04-11 | 2014-07-23 | 卢育文 | Multi-pile carrying plate push device for building block forming machine |
| CN104875417B (en) * | 2015-05-05 | 2017-01-04 | 浙江大学 | A kind of hydraulic forming device for suppressing moulded coal and control method thereof |
| CN106077633B (en) * | 2016-08-24 | 2018-06-12 | 广州晶体科技有限公司 | Beading cold stamping die and the beading production method using the cold stamping die |
| CN106077634B (en) * | 2016-08-24 | 2018-06-12 | 广州晶体科技有限公司 | Beading cold stamping die and the beading production method using the cold stamping die |
| CN109719834B (en) * | 2019-03-15 | 2023-09-19 | 洛阳理工学院 | Concrete test block manufacturing device easy to demould |
| TWI811696B (en) * | 2021-06-09 | 2023-08-11 | 遠東科技大學 | Ultra-thin ceramic sheet manufacturing method |
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2002
- 2002-11-28 CN CNB021509093A patent/CN1172796C/en not_active Expired - Fee Related
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| CN1418769A (en) | 2003-05-21 |
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Granted publication date: 20041027 Termination date: 20121128 |