CN102225629B - Multisource dynamic pressure isopressing powder molding process - Google Patents
Multisource dynamic pressure isopressing powder molding process Download PDFInfo
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Abstract
The invention relates to a powder molding process, in particular to a multisource dynamic pressure isopressing powder molding process. In the invention, the problems of excessive driving pressure and expansive cost in the existing isostatic pressing technology can be solved. The multisource dynamic pressure isopressing powder molding process comprises the following steps of: (1) sleeving a bag filled with powder in a work cylinder cavity of an isostatic press; (2) sealing the work cylinder cavity; (3) charging a working solution in the work cylinder cavity through each solution inlet to stably rise pressure; (4) charging the working solution in the work cylinder cavity through each solution inlet to pressurize; (5) stably releasing the pressure and taking out the molded powder. By using the multisource dynamic pressure isopressing powder molding process, the problems of excessive driving pressure and expansive cost in the existing isostatic pressing technology can be solved effectively, the process is not only suitable for a wet bag isopressing, but also suitable for a dry bag isopressing.
Description
Technical field
The present invention relates to the powder forming technique, specifically is static pressure powder moulding process such as a kind of multi-source dynamic pressure.
Background technology
Be the forming technique that is widely used in powders such as powder metallurgy, refractory material, pottery, graphite Deng static pressure, its basic principle is the superhigh pressure liquid medium that the elastic mould of interior dress powder (jacket) is placed 300 ~ 1000MPa, make the powder of moulding be subjected to respectively making it moulding to identical pressure, so static pressure such as names.Use all advantages of even plastic complex parts of density that the goods of isostatic pressing technology moulding have density height, a pressed compact.In extrusion forming and keep need overcoming in the load process resistances such as friction, distortion of powder, owing to adopt static pressure work, driving pressure all is required to be hyperpressure Deng static pressure.Present isostatic pressing machine prevailing price is high, its reason is that just the driving pressure of isostatic pressing machine is excessive, namely because the working media of isostatic pressing machine works in the super-pressure state, cause main carrying such as frame, the working cylinder parts of isostatic pressing machine must adopt the winding arrangement of very big sectional area or adopting process complexity, the pipeline of hydraulic system and valve member also need supporting with hyperpressure simultaneously; Based on this, be necessary existing equal pressing forming technology is reformed, to solve the problem of the excessive and cost costliness of existing equal pressing forming technology driving pressure.
Summary of the invention
The present invention provides static pressure powder moulding process such as a kind of multi-source dynamic pressure in order to solve the problem of the excessive and cost costliness of existing equal pressing forming technology driving pressure.
The present invention adopts following technical scheme to realize: static pressure powder moulding process such as multi-source dynamic pressure, this technology is to adopt following steps to realize: the jacket that (1) will be equipped with powder places the working cylinder inner chamber of isostatic pressing machine, and offer pressure relief opening and several inlets at working cylinder chamber wall, at each inlet a fluctuation pressure power source is installed then; (2) the working cylinder inner chamber is sealed; (3) charging into working solution by each inlet to the working cylinder inner chamber stablizes and boosts, as shown in Figure 2, in the stable process of boosting, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, extrusion modling is carried out to the powder in the jacket in the dynamic pressure field of force, guarantees that powder is stressed evenly in all directions in forming process; (4) charge into working solution by each inlet to the working cylinder inner chamber and carry out pressurize, in the process of pressurize, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, the dynamic pressure field of force is pushed the moulding powder, improves the packing of moulding powder, and the internal stress of minimizing moulding powder, and then the crack defect of minimizing moulding powder; (5) open pressure relief opening, release working solution by pressure relief opening and carry out steady pressure release, and take out in type powder.
In the described step (1), described isostatic pressing machine, fluctuation pressure power source are existing known products, namely can realize static pressure powder moulding process such as multi-source dynamic pressure of the present invention fully by existing isostatic pressing machine, fluctuation pressure power source.
In described step (3) and (4), according to the difference of powder characteristics, each fluctuation pressure power source is selected square wave or sine wave at the waveform of fluctuation pressure that each inlet superposes; According to what of powder component, each fluctuation pressure power source is selected single amplitude or composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes, when the powder component is one-component, each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes, and namely each fluctuation pressure power source adopts same-amplitude; When the powder component was various ingredients, each fluctuation pressure power source was composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes, and namely various amplitude is adopted in each fluctuation pressure source.
Static pressure powder moulding process such as multi-source dynamic pressure of the present invention carry out extrusion forming by the dynamic pressure field of force of adopting change at random to powder, greatly reduce friction of granule power between powder, thereby can reduce driving pressure in the forming process greatly, only make it to be the 1%-3% of former driving pressure, simultaneously, the dynamic pressure field energy of change at random is effectively destroyed the arch structure of powder in forming process, prevents the rising of shaping resistance, guarantees the density of powder; Therefore compare with existing equal pressing forming technology, the driving pressure of static pressure powder moulding process such as multi-source dynamic pressure of the present invention significantly dwindles, and technical costs declines to a great extent thereupon.
The present invention efficiently solves the problem of the excessive and cost costliness of existing equal pressing forming technology driving pressure, is not only applicable to wet static pressure such as bag grade, equally also is applicable to static pressure such as dry bag.
Description of drawings
Fig. 1 is working state schematic representation of the present invention.
Fig. 2 is the pressue-graph of the stable process of boosting of the present invention.
Fig. 3 is first kind of oscillogram of fluctuation pressure of the present invention.
Fig. 4 is second kind of oscillogram of fluctuation pressure of the present invention.
The specific embodiment
Embodiment one
Static pressure powder moulding process such as multi-source dynamic pressure, this technology are to adopt following steps to realize:
(1) jacket that powder will be housed places the working cylinder inner chamber of isostatic pressing machine, and offers pressure relief opening and several inlets at working cylinder chamber wall, at each inlet a fluctuation pressure power source is installed then; (2) the working cylinder inner chamber is sealed; (3) charging into working solution by each inlet to the working cylinder inner chamber stablizes and boosts, in the stable process of boosting, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, form the dynamic pressure field of force of change at random, extrusion modling is carried out to the powder in the jacket in the dynamic pressure field of force, guarantees that powder is stressed evenly in all directions in forming process; (4) charge into working solution by each inlet to the working cylinder inner chamber and carry out pressurize, in the process of pressurize, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, the dynamic pressure field of force is pushed the moulding powder, improves the packing of moulding powder, and the internal stress of minimizing moulding powder, and then the crack defect of minimizing moulding powder; (5) open pressure relief opening, release working solution by pressure relief opening and carry out steady pressure release, and take out in type powder;
As shown in Figure 3, in the described step (3), each fluctuation pressure power source is square wave at the waveform of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is square wave at the waveform of fluctuation pressure that each inlet superposes;
In the described step (3), each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes.
Embodiment two
Static pressure powder moulding process such as multi-source dynamic pressure, this technology are to adopt following steps to realize:
(1) jacket that powder will be housed places the working cylinder inner chamber of isostatic pressing machine, and offers pressure relief opening and several inlets at working cylinder chamber wall, at each inlet a fluctuation pressure power source is installed then; (2) the working cylinder inner chamber is sealed; (3) charging into working solution by each inlet to the working cylinder inner chamber stablizes and boosts, in the stable process of boosting, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, form the dynamic pressure field of force of change at random, extrusion modling is carried out to the powder in the jacket in the dynamic pressure field of force, guarantees that powder is stressed evenly in all directions in forming process; (4) charge into working solution by each inlet to the working cylinder inner chamber and carry out pressurize, in the process of pressurize, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, the dynamic pressure field of force is pushed the moulding powder, improves the packing of moulding powder, and the internal stress of minimizing moulding powder, and then the crack defect of minimizing moulding powder; (5) open pressure relief opening, release working solution by pressure relief opening and carry out steady pressure release, and take out in type powder;
As shown in Figure 4, in the described step (3), each fluctuation pressure power source is sine wave at the waveform of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is sine wave at the waveform of fluctuation pressure that each inlet superposes;
In the described step (3), each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes.
Embodiment three
Static pressure powder moulding process such as multi-source dynamic pressure, this technology are to adopt following steps to realize:
(1) jacket that powder will be housed places the working cylinder inner chamber of isostatic pressing machine, and offers pressure relief opening and several inlets at working cylinder chamber wall, at each inlet a fluctuation pressure power source is installed then; (2) the working cylinder inner chamber is sealed; (3) charging into working solution by each inlet to the working cylinder inner chamber stablizes and boosts, in the stable process of boosting, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, form the dynamic pressure field of force of change at random, extrusion modling is carried out to the powder in the jacket in the dynamic pressure field of force, guarantees that powder is stressed evenly in all directions in forming process; (4) charge into working solution by each inlet to the working cylinder inner chamber and carry out pressurize, in the process of pressurize, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, the dynamic pressure field of force is pushed the moulding powder, improves the packing of moulding powder, and the internal stress of minimizing moulding powder, and then the crack defect of minimizing moulding powder; (5) open pressure relief opening, release working solution by pressure relief opening and carry out steady pressure release, and take out in type powder;
As shown in Figure 3, in the described step (3), each fluctuation pressure power source is square wave at the waveform of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is square wave at the waveform of fluctuation pressure that each inlet superposes;
In the described step (3), each fluctuation pressure power source is composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes.
Embodiment four
Static pressure powder moulding process such as multi-source dynamic pressure, this technology are to adopt following steps to realize:
(1) jacket that powder will be housed places the working cylinder inner chamber of isostatic pressing machine, and offers pressure relief opening and several inlets at working cylinder chamber wall, at each inlet a fluctuation pressure power source is installed then; (2) the working cylinder inner chamber is sealed; (3) charging into working solution by each inlet to the working cylinder inner chamber stablizes and boosts, in the stable process of boosting, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, form the dynamic pressure field of force of change at random, extrusion modling is carried out to the powder in the jacket in the dynamic pressure field of force, guarantees that powder is stressed evenly in all directions in forming process; (4) charge into working solution by each inlet to the working cylinder inner chamber and carry out pressurize, in the process of pressurize, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, the dynamic pressure field of force is pushed the moulding powder, improves the packing of moulding powder, and the internal stress of minimizing moulding powder, and then the crack defect of minimizing moulding powder; (5) open pressure relief opening, release working solution by pressure relief opening and carry out steady pressure release, and take out in type powder;
As shown in Figure 4, in the described step (3), each fluctuation pressure power source is sine wave at the waveform of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is sine wave at the waveform of fluctuation pressure that each inlet superposes;
In the described step (3), each fluctuation pressure power source is composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes.
Claims (5)
1. static pressure powder moulding process such as multi-source dynamic pressure is characterized in that: this technology is to adopt following steps to realize:
(1) jacket that powder will be housed places the working cylinder inner chamber of isostatic pressing machine, and offers pressure relief opening and several inlets at working cylinder chamber wall, at each inlet a fluctuation pressure power source is installed then;
(2) the working cylinder inner chamber is sealed;
(3) charging into working solution by each inlet to the working cylinder inner chamber stablizes and boosts, in the stable process of boosting, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, form the dynamic pressure field of force of change at random, extrusion modling is carried out to the powder in the jacket in the dynamic pressure field of force, guarantees that powder is stressed evenly in all directions in forming process;
(4) charge into working solution by each inlet to the working cylinder inner chamber and carry out pressurize, in the process of pressurize, each fluctuation pressure power source is in each inlet of correspondence fluctuation pressure that successively superposes, the fluctuation pressure of each inlet is interfered mutually, and in working cylinder, forming the dynamic pressure field of force of change at random, the dynamic pressure field of force is pushed the moulding powder, improves the packing of moulding powder, and the internal stress of minimizing moulding powder, and then the crack defect of minimizing moulding powder;
(5) open pressure relief opening, release working solution by pressure relief opening and carry out steady pressure release, and take out in type powder.
2. static pressure powder moulding process such as multi-source dynamic pressure according to claim 1, it is characterized in that: in the described step (3), each fluctuation pressure power source is square wave at the waveform of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is square wave at the waveform of fluctuation pressure that each inlet superposes.
3. static pressure powder moulding process such as multi-source dynamic pressure according to claim 1 is characterized in that: in the described step (3), each fluctuation pressure power source at the waveform of fluctuation pressure that each inlet superposes for sinusoidal wave; In the described step (4), each fluctuation pressure power source is sine wave at the waveform of fluctuation pressure that each inlet superposes.
4. according to static pressure powder moulding process such as claim 2 or 3 described multi-source dynamic pressures, it is characterized in that: in the described step (3), each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is single amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes.
5. according to static pressure powder moulding process such as claim 2 or 3 described multi-source dynamic pressures, it is characterized in that: in the described step (3), each fluctuation pressure power source is composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes; In the described step (4), each fluctuation pressure power source is composite amplitude at the amplitude of wave form of fluctuation pressure that each inlet superposes.
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| CN 201110083457 CN102225629B (en) | 2011-04-02 | 2011-04-02 | Multisource dynamic pressure isopressing powder molding process |
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| CN 201110083457 CN102225629B (en) | 2011-04-02 | 2011-04-02 | Multisource dynamic pressure isopressing powder molding process |
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| CN102225629B true CN102225629B (en) | 2013-10-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2051134A (en) * | 1979-04-11 | 1981-01-14 | Inoue Japax Res | Sintering method and apparatus using a multi-directional compression system and a powder mould |
| DE19602536A1 (en) * | 1996-01-25 | 1997-07-31 | Graefer Albrecht | Press-forming process for parts of granulate |
| US6030576A (en) * | 1997-08-01 | 2000-02-29 | Sacmi-Cooperativa Meccanici Imola-Soc. Coop. A.R.L. | Method for forming ceramic tiles by means of partially isostatic moulds |
| US6372166B1 (en) * | 1997-08-01 | 2002-04-16 | Sacmi-Cooperativa Meccanici Imola-Soc. Coop. A R. L. | Method and apparatus for the dry-forming of crockery |
| CN2609753Y (en) * | 2003-01-19 | 2004-04-07 | 董中平 | Isostatic pressing machine |
-
2011
- 2011-04-02 CN CN 201110083457 patent/CN102225629B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2051134A (en) * | 1979-04-11 | 1981-01-14 | Inoue Japax Res | Sintering method and apparatus using a multi-directional compression system and a powder mould |
| DE19602536A1 (en) * | 1996-01-25 | 1997-07-31 | Graefer Albrecht | Press-forming process for parts of granulate |
| US6030576A (en) * | 1997-08-01 | 2000-02-29 | Sacmi-Cooperativa Meccanici Imola-Soc. Coop. A.R.L. | Method for forming ceramic tiles by means of partially isostatic moulds |
| US6372166B1 (en) * | 1997-08-01 | 2002-04-16 | Sacmi-Cooperativa Meccanici Imola-Soc. Coop. A R. L. | Method and apparatus for the dry-forming of crockery |
| CN2609753Y (en) * | 2003-01-19 | 2004-04-07 | 董中平 | Isostatic pressing machine |
Non-Patent Citations (2)
| Title |
|---|
| "陶瓷等静压成形机油腔的数值模拟及其改进设计";程洪涛等;《佛山陶瓷》;20090930;第19卷(第9期);第30-32页 * |
| 程洪涛等."陶瓷等静压成形机油腔的数值模拟及其改进设计".《佛山陶瓷》.2009,第19卷(第9期),第30-32页. |
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