CN116922546B - Method for manufacturing molded part by using zirconia and pump flow passage component - Google Patents
Method for manufacturing molded part by using zirconia and pump flow passage component Download PDFInfo
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- CN116922546B CN116922546B CN202311199310.6A CN202311199310A CN116922546B CN 116922546 B CN116922546 B CN 116922546B CN 202311199310 A CN202311199310 A CN 202311199310A CN 116922546 B CN116922546 B CN 116922546B
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 282
- 238000000034 method Methods 0.000 title claims abstract description 96
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 72
- 238000011049 filling Methods 0.000 claims abstract description 60
- 238000000465 moulding Methods 0.000 claims abstract description 24
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 238000003754 machining Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 210000001161 mammalian embryo Anatomy 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 56
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 26
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 238000012856 packing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/022—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/087—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to a method for manufacturing a formed part by using zirconia and a pump flow passage component, belongs to the technical field of zirconia forming, and solves the technical problem that thermal expansion stress influences the forming quality of the formed part in the prior art. The method comprises the steps that at least a blank body is arranged in an A-type area of a die of a piece to be formed, and the blank body at least forms a release structure; filling zirconia into a mold by a multistage pressure preforming process, and filling the zirconia into a B-type region by the multistage pressure preforming process; and (5) molding treatment. In the sintering process, when stress appears at the connection position of the blank body and the zirconia, the release structure can release part or all of the stress, so that the accumulation of the stress on the surface of the connection position is weakened, and the damage of the stress to the blank body or the zirconia molding is weakened or slowed down; the multistage pressure preforming process can ensure the filling rate and the filling compactness of zirconia powder in the B-class area, and further improve the forming quality and the forming strength of the formed part.
Description
Technical Field
The invention belongs to the technical field of zirconia molding, relates to a technology for reducing the influence of thermal expansion stress on molding quality of a molded part and avoiding structural deficiency of the molded part, and particularly relates to a method for manufacturing the molded part by using zirconia and a pump flow passage part.
Background
Zirconia ceramics have excellent properties such as high melting point and boiling point, high hardness, being an insulator at normal temperature, and electrical conductivity at high temperature.
Therefore, it is often used for making various molded articles. The zirconia ceramics are formed by dry press forming isostatic pressing, slip casting, hot die casting, injection molding, plastic extrusion molding, colloidal solidification molding, and the like. The most widely used of these are injection molding and dry compression molding.
However, when the dry press molding method is used, since some molded parts have processing characteristics, for example, the molded parts have structural characteristics such as male threads, holes, grooves or cavities, and further, the structural characteristics need to be precisely processed later, and the thermal expansion coefficient of zirconia is large, the structural characteristics are deformed during the molding process, so that the structure of the molded parts is lost or damaged. Furthermore, the formation of the structural features can be ensured by embedding the metal preformed piece in the zirconia forming stage, but because of the different thermal expansion coefficients of the zirconia and the metal preformed piece, relatively large stress is generated at the joint of the zirconia and the metal preformed piece when the zirconia and the metal preformed piece are subjected to high-temperature sintering treatment, and the stress can damage or affect the structure of the formed piece.
In addition to the aforementioned problems, some molded parts also have more specific structural features, such as reentrant corner regions (molded parts having a very small-sized shaped structure or a non-shaped structure), and the like. In particular, when the molded part is a pump, the pump has an excess flow component, such as an impeller, a pump body (volute), a pump cover or a guide vane. These flow-through parts typically have more reentrant areas or more angular side areas, and zirconia is more difficult to fill in these areas or more densely packed in these areas during the filling process, eventually leading to structural failure of the molded part (the pump flow-through part) and lower strength of the molded structure.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for manufacturing a molded part by using zirconia and a pump flow passage component.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
there is provided a method of making a shaped article using zirconia, comprising at least the steps of:
at least arranging a blank in an A-type area of a die of a piece to be formed, wherein the blank at least forms a release structure;
filling zirconia into a mold in a multi-stage pressure pre-forming process, wherein the zirconia is filled into a class B region at least through the multi-stage pressure pre-forming process;
and forming, wherein the forming at least comprises sintering, and the release structure of the blank can be used for releasing the expansion stress of the blank and the expansion stress of zirconia during forming when the sintering is carried out.
Preferably, the class a region encompasses at least the tooling characteristics of the molded part, including but not limited to: threads, holes, slots, chambers; and
the class B region encompasses at least structural features of the molded part including, but not limited to: a reentrant angle, a lateral region with an angle of inclination a, a lateral region with an angle of inclination B, or an inverted region.
Preferably, the release structure at least comprises a release cavity formed inside the embryo body and having a hollow structure, and a release channel communicated with the release cavity.
Preferably, the multi-stage pressure preforming process comprises at least:
a first stage preform process comprising at least a first filling stage and a first pressurization stage, the first filling stage being at least: filling zirconia into the mold, wherein the filling height H of the zirconia is at least higher than the height of a B-type area of the formed part at the filling position; and the first pressurization phase is at least used for providing the pressure of a preset pressure range A1 for the filling surface of zirconia and the duration of a preset time range T1;
a second stage pre-forming treatment comprising at least a second pressurization stage for providing again the filling surface of zirconia with a pressure of a preset pressure range A2, and a duration of a preset time range T2;
a third stage preform process, the third stage preform process being at least: repeating the first stage preform treatment and the second stage preform treatment until the forming cavity of the mold is completely filled with zirconia;
a fourth stage pre-forming process for providing at least a pressure of a preset pressure range A3 to the filling surface of zirconia, which has been filled, and a duration of a preset time range T3.
Preferably, the preset pressure range A1 is smaller than the preset pressure range A2 and smaller than the preset pressure range A3.
Preferably, the preset pressure range A1 takes the value of: 10-15MPa, wherein the preset time range T1 is as follows: 5-20sec; and/or
The preset pressure range A2 has the following value: 20-30MPa, wherein the preset time range T2 is as follows: 5-10sec; and/or
The preset pressure range A3 has the following value: 100-200MPa, wherein the preset time range T3 is as follows: 1-3min.
Preferably, the first stage preform treatment further comprises:
and a vibration treatment, which is a simultaneous treatment program of the first pressurizing stage and a pre-treatment program of the second stage pre-forming treatment, for providing a vibration action of a vibration frequency range B to the filling surface of zirconia in the first pressurizing stage in a preset pressure range A1 and a preset time range T1.
Preferably, the vibration frequency range B takes the value of: 30-100Hz.
Preferably, the molding process further includes:
a machining process for machining at least the class a region to form a machined feature of the molded part;
surface treatment at least for grinding, polishing and coating the surface of the shaped part.
The invention also provides a pump flow passage component which is manufactured by the method for manufacturing the molded part by using zirconium oxide according to any one of the technical schemes.
The invention provides a method for manufacturing a molded part by using zirconia and a pump flow passage component, which have the beneficial effects that:
in the sintering process, when stress appears at the connection position of the blank body and the zirconia, the release structure can release part or all of the stress, so that the accumulation of the stress on the surface of the connection position is weakened, and the damage of the stress to the blank body or the zirconia molding is weakened or slowed down;
the multistage pressure preforming process can ensure the filling rate and the filling compactness of zirconia powder in the B-class area, and further improve the forming quality and the forming strength of the formed part.
Drawings
FIG. 1 is a flow chart of a method of forming a shaped article using zirconia according to the present invention;
FIG. 2 is a flow chart of a multi-stage pressure preforming process in a method of making a shaped article using zirconia in accordance with the present invention;
FIG. 3 is a schematic molding diagram of a method for producing a molded article using zirconia according to the present invention;
FIG. 4 is a schematic diagram illustrating the formation of a pump flow block according to the present invention;
fig. 5 is a schematic structural view of a blank in a pump flow-through component according to the present invention.
Description of the reference numerals
1. A mold; 2. a class a region; 3. a class B region; 4. the embryo body, 401, release cavity; 402. releasing the channel.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the following specific embodiments of the present invention are provided:
as shown in fig. 1 to 3, a first embodiment of the present invention proposes a method for manufacturing a molded article using zirconia, comprising at least the steps of:
at least in the class A region 2 of the mould 1 of the part to be formed, a blank 4 is arranged, wherein the blank 4 forms at least one release structure;
filling zirconia into a mold 1 in a multi-stage pressure pre-forming process, wherein the zirconia is filled into a B-class region 3 at least through the multi-stage pressure pre-forming process;
and a molding process including at least a sintering process, wherein the release structure of the green body 4 can be used to release the expansion stress of the green body 4 and the expansion stress at the time of zirconia molding when the sintering process is performed.
In this example, the zirconia molding process was analyzed as follows:
first, if the metal pre-formed part is omitted in the forming process, after the forming part is formed, secondary processing is required in the a-type area of the forming part to form the processing characteristics of the forming part. However, it is known that, due to the specificity of zirconia after molding, when the surface is subjected to secondary processing, such as drilling, grooving, etc., fine lines in the processing area are extremely likely to be generated, and the molded part is more severely broken or damaged.
Therefore, under this analysis, we wish to preserve the metal reservations.
Secondly, if the metal reserved piece is reserved in the forming process, because the zirconia and the metal reserved piece have a thermal expansion coefficient with a larger difference, when the zirconia and the metal reserved piece are sintered, the connecting position of the zirconia and the metal reserved piece is further caused to generate larger stress due to the existence of the problems, and the stress can damage the processing characteristics of the metal reserved piece or the formed piece formed by the metal reserved piece to a certain extent.
Based on this, the process of retaining the metal reserve is added in the advanced stage of zirconia filling, i.e. the placement of the blank 4 in the zone a2 of the mould 1. Further, the embryo body 4 is formed with a release structure. Wherein, the blank 4 is a metal piece, and the shape and the size of the blank are adapted and adjusted according to the A-type area. For example, when it is desired to form holes in the class a region, the blank 4 may be a columnar structure of metal to form a desired hole structure at this location after the molding is finished. Alternatively, the selection of the blank 4 may be made according to the processing characteristics desired for the formation of the class a region, which will not be described in detail herein.
The release structure is understood in this embodiment to be: during sintering, when stress appears at the connection position of the blank body 4 and the zirconia, the release structure can release part or all of the stress, so that the accumulation of the stress on the surface of the connection position is weakened, and the damage of the stress to the blank body 4 or the zirconia molding is weakened or slowed down. The release mode of the release structure can be realized in a mode of micro deformation.
As a further consideration, we have found that zirconia is more difficult to enter the class B region 3 of the mold 1 or that the zirconia is less dense in the class B region 3 to the desired value. Class B region 3 is defined as: a reentrant angle, a lateral region with an angle of inclination a, a lateral region with an angle of inclination B, or an inverted region. Wherein the inclination angle a may range from 20 ° to 80 °, and the inclination angle B may range from 20 ° to 80 °.
Based on this, a multi-stage pressure preforming process is added.
Wherein the multi-stage pressure preforming process comprises at least a plurality of stages.
In one of the stages, part of the zirconia powder is filled into the mould 1, and as the zirconia powder has certain flow properties, it is desirable to take advantage of this property to make it easier for the zirconia powder to enter the class B region 3.
For example, after a portion of zirconia has been filled into the mold 1, the zirconia powder may be given a certain kinetic energy by pressurizing the filling surface, which contributes to its entry into the class B region 3 of the mold 1.
In another of these stages, it is desirable that the zirconia powder entering the class B region 3 has a higher degree of compaction. Thus, the filling surface can be pressurized again so that the pressure is transmitted between the powder particles, and finally transmitted to the powder particles located in the B-type region 3, thereby further filling the blank region of the B-type region 3 and forming a higher degree of compaction in the B-type region 3.
It should be noted that since the zirconia powder is solid particles, it is extremely prone to the hardening effect when subjected to sudden pressure and long duration pressurization. This effect causes the zirconia powder in a certain region to solidify into a solid structure having a larger volume, thereby causing the zirconia powder to have a reduced fluidity and a blocked filling path.
Based on this, the foregoing two stages are performed in batches and cyclically. I.e., the first stage and the second stage are alternated so that the zirconia powder can be filled into the grinding tool a small number of times.
Finally, after the multi-stage pressure preforming process is finished, forming treatment is carried out. The forming process at least comprises sintering process, wherein in the sintering process, the release structure of the blank 4 plays the role, so that the influence of stress on the forming process of the forming part is weakened in a stress release manner, and finally the yield of the forming part is improved.
In addition, the particle size of the material is selected: the zirconia powder is selected to have a particle size in the range of 0.5 to 50 microns, preferably 0.5 to 15 microns. When the powder in the range is formed by pressing, the powder has better fluidity under smaller pressure, and the packing compactness of materials in space such as internal corners and the like is obviously improved when the powder is formed in a non-columnar (complex structure) mode.
In addition, fig. 3 is only a schematic view which is easy to understand, the shape of the mold is selected according to the shape of the molding member, and the shapes and sizes of the a-type region, the B-type region and the blank are selected according to the actual working conditions. The present embodiment also does not merely protect the specific structure shown in fig. 3.
A second embodiment of the present invention proposes a method for manufacturing a shaped article using zirconia, and on the basis of the first embodiment, the class a region 2 covers at least the processing features of the shaped article, including but not limited to: threads, holes, slots, chambers; and the class B region 3 encompasses at least the structural features of the molded part, including but not limited to: a reentrant angle, a lateral region having an angle of inclination a, or an inverted region. Wherein the inclination angle a may range from 20 ° to 80 °, and the inclination angle B may range from 20 ° to 80 °.
In this embodiment, as described above, it is desirable that the problems existing for both the class a region 2 and the class B region 3 are solved.
Based on this, when processing the processing characteristics of the molded article, i.e., the class a region 2, we perform the following analysis on the essence of the class a region 2:
firstly, the processing features can be processed a second time later, thus allowing for a more or less certain deviation in the dimensions during the forming process. And the deviation can be corrected according to the secondary processing. Thus, during the forming process, the machining of the class a region 2 is more prone to preserve its structural integrity, on the basis of which dimensional accuracy is re-preserved;
second, the class a region 2 is not required to be filled with zirconia, so that the problem of the filling rate and the compactness of zirconia powder in the class a region 2 is not required to be considered.
Based on this, when the blank 4 is provided in the a-type region 2, the space of the a-type region 2 can be sufficiently occupied, and on the one hand, the formation of the processing feature can be ensured, and of course, the blank 4 may be preformed into a structure having the same shape and size as the desired processing feature, or the blank 4 may be preformed into a structure having a shape and size close to the desired processing feature, so as to form the desired processing feature by means of secondary processing. On the other hand, when the class a region 2 is occupied, it is possible to provide a certain supporting effect to the zirconia powder therearound, ensuring the packing density of the zirconia powder in the remaining region in such a manner that a supporting force is formed inside. Further, considering the aforementioned problem of expansion stress, the blank 4 is provided with a releasing structure to release stress generated on the zirconia powder and the surface of the blank 4, and of course, based on the aforementioned first point analysis, we allow a certain deviation of the class a region 2, so that the releasing structure can be realized in a micro deformation manner.
In processing the structural features of the shaped part, namely the class B region 3, we have the following analysis of the nature of the class B region 3:
first, structural features are somewhat specialized in that secondary processing and modification requirements are relatively high for some smaller or thinner structural features. In this process, the structural features are extremely susceptible to damage, thereby rendering the entire molded part useless. Thus, it is desirable to ensure the zirconia filling rate when filling the B-type region 3.
Secondly, the structural features need to have a certain strength or rigidity. An important factor affecting the strength or rigidity is the packing density of the zirconia powder in the class B region 3. Thus, it is desirable to ensure zirconia compactness when filling the class B region 3.
Based on the two-point analysis described above, we have optimized and improved the filling process, such as the multi-stage pressure pre-forming process described above. The effects are shown in the foregoing, and will not be described in detail herein, and the multi-stage pressure preforming process will be described in more detail below.
A third embodiment of the present invention proposes a method for manufacturing a molded article using zirconia, and on the basis of the above embodiment, the release structure at least includes a release cavity 401 formed inside the blank 4 and having a hollow structure, and a release channel 402 communicating with the release cavity 401.
In this embodiment, one particular form of release structure is provided.
Wherein the release structure is constituted by a release cavity 401 and a release channel 402.
The release cavity 401 forms a hollow-structured chamber inside the blank 4. The release channel 402 may be in the form of a hole formed in the surface of the blank 4 and communicating with the release cavity 401.
When stress is formed on the surface of the green body 4, the relief cavity 401 is able to contract within a certain range to attenuate the direct effect of the stress on the green body 4.
On the basis of the above, if the release cavity 401 is in a completely closed state, the ability of the blank 4 to withstand the stress is reduced. In particular, when the stress is too large, damage to the embryo body 4 is extremely liable to occur, and failure is caused. Based on this, a release passage 402 is provided on the blank 4. When the blank 4 is deformed, the release channel 402 allows the release cavity 401 to have a relatively large deformation degree, so as to meet the requirement of stress release.
A fourth embodiment of the present invention provides a method for manufacturing a molded part using zirconia, and based on the above embodiment, the multi-stage pressure preforming process at least includes:
a first stage preform process comprising at least a first filling stage and a first pressurization stage, the first filling stage being at least: filling zirconia into the mould 1, wherein the filling height H of the zirconia is at least higher than the height of the class B region 3 of the formed part at the filling position; and the first pressurization phase is at least used for providing the pressure of a preset pressure range A1 for the filling surface of zirconia and the duration of a preset time range T1;
a second stage pre-forming treatment comprising at least a second pressurization stage for providing again the filling surface of zirconia with a pressure of a preset pressure range A2, and a duration of a preset time range T2;
a third stage preform process, the third stage preform process being at least: repeating the first stage preforming treatment and the second stage preforming treatment until the forming cavity of the die 1 is completely filled with zirconia;
a fourth stage pre-forming process for providing at least a pressure of a preset pressure range A3 to the filling surface of zirconia, which has been filled, and a duration of a preset time range T3.
In the present embodiment, a multistage pressure preforming process is specifically defined.
Wherein the multi-stage pressure preforming process comprises four stages.
In the first stage preform processing, the zirconia powder filling rate of the B-type region 3 of the mold 1 is mainly considered. Thus, the first stage preform process includes at least two actions.
In the first filling stage, a small amount of filling zirconia powder is required, the filling height of which is at least to cover part of the class B region 3. The zirconia powder is actively filled into the partial B-type region 3 by its fluidity.
In the first pressurization phase, the filling surface needs to be pressurized. Preferably, the air bag can be pressurized. By applying a set pressure to the zirconia powder, it is ensured that the zirconia powder further passively flows, thereby filling the blank region of the class B region 3 completely.
In the second stage preforming process, the packing density of the zirconia powder of the class B region 3 of the mold 1 is mainly considered. Thus, the second stage preform process includes at least one action. I.e. the filling surface is again subjected to pressure. Likewise, the air bag can be pressurized. The pressure applied in the second pressurization stage is substantially greater than the pressure applied in the first pressurization stage. The reason is that the pressure applied in the first pressurizing stage can to some extent give the zirconia powder a certain degree of compactness, and thus, at this time, the zirconia powder is relatively difficult to perform again, such as flow, for the pressure which does not change much. Based on this, when a relatively large pressure is applied in the second pressurization stage, the zirconia powder can be caused to flow again to further fill the B-type region 3. Furthermore, since the zirconia powder has undergone a single pressurization step, the zirconia powder is not easily hardened by the application of pressure again in comparison with the original loose zirconia powder.
The third-stage preforming process is a cyclic process of cyclically repeating the aforementioned first-stage preforming process and second-stage preforming process until the forming chamber of the mold 1 is completely filled with zirconia powder.
It can be seen that the zirconia powder filled in the mold 1 has a larger filling rate and a higher packing density through the treatment process of multiple filling and multiple pressurization.
After the above process is completed, a fourth stage preform process is performed. In this process, the zirconia powder after the filling is pressurized to further improve the compactness of the zirconia powder as a whole.
A fifth embodiment of the present invention proposes a method for manufacturing a molded article using zirconia, and on the basis of the above embodiment, the preset pressure range A1 is smaller than the preset pressure range A2 and smaller than the preset pressure range A3.
In this embodiment, as previously described, it is desirable that the filling and pressurizing process have the following advantages:
firstly, avoiding hardening of zirconia powder so as to reduce the occurrence of regional forming to form blocking materials;
secondly, the degree of the zirconia powder subjected to the previous pressurization is improved to the extent that the zirconia powder subjected to the previous pressurization is subjected to the next pressurization, so that the zirconia powder is subjected to the action again.
Based on this, the pressurizing pressures in three of the stages are defined.
I.e. the preset pressure range A1 is smaller than the preset pressure range A2 and smaller than the preset pressure range A3. When the pressure of the first pressurizing stage and the pressure of the second pressurizing stage are obviously changed, the pressure sensitivity of the zirconia powder to the second pressurizing stage can be improved, and then the zirconia powder flows easily, so that the packing compactness of the zirconia powder is further improved, and the zirconia powder is compacted in the area where the zirconia powder is filled, so that the packing compactness of the area is improved. Furthermore, the pressurization is carried out with a relatively small pressure in the first pressurization stage, so that the loose zirconia powder can be prevented from hardening to some extent.
A sixth embodiment of the present invention provides a method for manufacturing a molded article using zirconia, wherein on the basis of the previous embodiment, the preset pressure range A1 has the following values: 10-15MPa, wherein the preset time range T1 is as follows: 5-20sec; and/or
The preset pressure range A2 has the following value: 20-30MPa, wherein the preset time range T2 is as follows: 5-10sec; and/or
The preset pressure range A3 has the following value: 100-200MPa, wherein the preset time range T3 is as follows: 1-3min.
In the present embodiment, the preset pressure ranges and durations of the respective stages are specifically defined.
In the actual operation process, the zirconia powder has higher filling rate and compactness after various preset pressures and durations in the above intervals are adopted. Moreover, for some of the more unusual structural features, such as non-columnar (complex structure) structural shaping, the packing density of zirconia powder in the reentrant corner region is significantly improved.
A seventh embodiment of the present invention provides a method for manufacturing a molded article using zirconia, and on the basis of the above embodiment, the first stage pre-molding process further includes:
and a vibration treatment, which is a simultaneous treatment program of the first pressurizing stage and a pre-treatment program of the second stage pre-forming treatment, for providing a vibration action of a vibration frequency range B to the filling surface of zirconia in the first pressurizing stage in a preset pressure range A1 and a preset time range T1.
In this example, we found that even if the filling of the zirconia powder is performed in a relatively small amount during the first-stage preforming treatment, the pressurization in the first pressurization stage is relatively static pressurization, and therefore, it is difficult to make the best use of the initial fluidity of the zirconia powder (the initial zirconia powder has a high fluidity).
Based on this, it is desirable to change from static pressurization to dynamic pressurization in the first pressurization stage. Dynamic pressurization can better utilize the fluidity of zirconia powder in the initial stage, so that the fluidity is fully utilized because of relatively less regular pressure rhythms.
Thus, the vibration treatment is added at the same time in the first pressurizing stage, and the air bag can vibrate. By this dynamic application, the zirconia powder can be made to flow sufficiently into the B-type region 3, thereby improving the filling rate thereof in the mold 1.
An eighth embodiment of the present invention provides a method for manufacturing a molded article using zirconia, wherein, based on the previous embodiment, the vibration frequency range B takes the values of: 30-100Hz.
In the present embodiment, the vibration frequency of the vibration process is defined. Taking the value in the above section can make the zirconia powder fill into the B-type region 3 more sufficiently, thereby improving the filling rate.
A ninth embodiment of the present invention provides a method for manufacturing a molded article using zirconia, and on the basis of the above embodiment, the molding process further includes:
a machining process for machining at least the class a region 2 to form a machined feature of the molded part;
surface treatment at least for grinding, polishing and coating the surface of the shaped part.
In this embodiment, the molding process is additionally defined.
Generally, after the molding process is completed, the molded article needs to be subjected to a processing treatment and a surface treatment. The processing treatment refers to secondary processing of the class A region 2 of the formed part, namely processing characteristics, so that the formed part meets the preset size requirement.
The surface treatment is to polish, coat, etc. the surface of the molded part, and will not be described in detail herein.
As shown in fig. 4 and 5, a tenth embodiment of the present invention proposes a pump flow-through member manufactured by the method of manufacturing a molded article using zirconia according to any one of the above embodiments.
In this embodiment, the pump flow-through components include, but are not limited to, impellers, pump bodies (volutes), pump covers or vanes, and the like. It has all the above-mentioned beneficial effects, and will not be described here again.
The pump flow passage component manufactured by the method has more complete structure of processing characteristics, so that the size and the specification of the pump flow passage component are more accurate after secondary processing and molding. And its structural features are of a relatively precise, desirable size and strength. Of course, the pump flow block also has the material advantage of zirconia ceramics, which is an excellent feature not found in pump flow blocks made of conventional materials.
In describing embodiments of the present invention, it is to be understood that terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "center", "top", "bottom", "inner", "outer", and the like indicate an azimuth or positional relationship.
In describing embodiments of the present invention, it should be noted that the terms "mounted," "connected," and "assembled" are to be construed broadly, as well as being either fixedly connected, detachably connected, or integrally connected, unless otherwise specifically indicated and defined; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of embodiments of the invention, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
In describing embodiments of the present invention, it will be understood that the terms "-" and "-" are intended to be inclusive of the two numerical ranges, and that the ranges include the endpoints. For example: "A-B" means a range greater than or equal to A and less than or equal to B. "A-B" means a range of greater than or equal to A and less than or equal to B.
In the description of embodiments of the present invention, the term "and/or" is merely an association relationship describing an association object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method of forming a shaped article from zirconia comprising at least the steps of:
at least arranging a blank in an A-type area of a die of a piece to be formed, wherein the blank at least forms a release structure;
filling zirconia into a mold in a multi-stage pressure pre-forming process, wherein the zirconia is filled into a class B region at least through the multi-stage pressure pre-forming process;
a molding process including at least a sintering process, wherein a release structure of the green body can be used to release an expansion stress of the green body and an expansion stress at the time of zirconia molding at the time of performing the sintering process;
the class a region encompasses at least the tooling characteristics of the molded part, including but not limited to: threads, holes, slots, chambers; and
the class B region encompasses at least structural features of the molded part including, but not limited to: a reentrant angle, a lateral region with an angle of inclination a, a lateral region with an angle of inclination B, or an inverted region.
2. The method of producing a molded article using zirconia according to claim 1, wherein,
the release structure at least comprises a release cavity formed in the embryo body and having a hollow structure, and a release channel communicated with the release cavity.
3. The method of making a shaped article using zirconia according to claim 2, wherein the multi-stage pressure preforming process comprises at least:
a first stage preform process comprising at least a first filling stage and a first pressurization stage, the first filling stage being at least: filling zirconia into the mold, wherein the filling height H of the zirconia is at least higher than the height of a B-type area of the formed part at the filling position; and the first pressurization phase is at least used for providing the pressure of a preset pressure range A1 for the filling surface of zirconia and the duration of a preset time range T1;
a second stage pre-forming treatment comprising at least a second pressurization stage for providing again the filling surface of zirconia with a pressure of a preset pressure range A2, and a duration of a preset time range T2;
a third stage preform process, the third stage preform process being at least: repeating the first stage preform treatment and the second stage preform treatment until the forming cavity of the mold is completely filled with zirconia;
a fourth stage pre-forming process for providing at least a pressure of a preset pressure range A3 to the filling surface of zirconia, which has been filled, and a duration of a preset time range T3.
4. A method for producing a molded article using zirconia as claimed in claim 3, wherein,
the preset pressure range A1 is smaller than the preset pressure range A2 and smaller than the preset pressure range A3.
5. The method of producing a molded article using zirconia as claimed in claim 4, wherein,
the preset pressure range A1 has the following value: 10-15MPa, wherein the preset time range T1 is as follows: 5-20sec; and/or
The preset pressure range A2 has the following value: 20-30MPa, wherein the preset time range T2 is as follows: 5-10sec; and/or
The preset pressure range A3 has the following value: 100-200MPa, wherein the preset time range T3 is as follows: 1-3min.
6. A method of making a shaped article using zirconia as in claim 3 wherein the first stage preform treatment further comprises:
and a vibration treatment, which is a simultaneous treatment program of the first pressurizing stage and a pre-treatment program of the second stage pre-forming treatment, for providing a vibration action of a vibration frequency range B to the filling surface of zirconia in the first pressurizing stage in a preset pressure range A1 and a preset time range T1.
7. The method of forming a shaped article from zirconia according to claim 6, wherein the vibration frequency range B has a value of: 30-100Hz.
8. The method of making a shaped article using zirconia according to claim 1, wherein the shaping process further comprises:
a machining process for machining at least the class a region to form a machined feature of the molded part;
surface treatment at least for grinding, polishing and coating the surface of the shaped part.
9. A pump flow-through member, characterized in that it is manufactured by the method of manufacturing a molded article using zirconia according to any one of claims 1 to 8.
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