CN112589955A - Powder injection molding method of ultra-thin wall honeycomb-shaped product - Google Patents
Powder injection molding method of ultra-thin wall honeycomb-shaped product Download PDFInfo
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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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/108—Mixtures obtained by warm mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1103—Making porous workpieces or articles with particular physical characteristics
- B22F3/1115—Making porous workpieces or articles with particular physical characteristics comprising complex forms, e.g. honeycombs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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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
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/12—Apparatus or processes for treating or working the shaped or preshaped articles for removing parts of the articles by cutting
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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
- 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
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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
- B28B7/00—Moulds; Cores; Mandrels
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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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/28—Cores; Mandrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F2003/1042—Sintering only with support for articles to be sintered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
Abstract
The invention discloses a powder injection molding method of an ultrathin-wall honeycomb product, which comprises the following steps: preparing a feed: mixing and banburying metal powder or ceramic powder with a binder and a lubricant, and extruding and granulating by a granulator after banburying to obtain feed particles; injection molding to obtain a green body of the honeycomb product part with the ultrathin wall; wherein the green honeycomb article part comprises a porous honeycomb structure and a flat flow guide portion; the flow guide part is positioned at one end of the porous honeycomb structure, and the flat-plate flow guide part is vertical to the holes of the honeycomb structure; degreasing and sintering; in the degreasing and sintering process of the green body of the honeycomb product part, the flat-plate-shaped flow guide part is used as a sintering support part; removing the flat flow guide part. By the method of the application, ultra-thin wall honeycomb products or products of similar structure can be realized.
Description
Technical Field
The invention relates to the technical field of powder injection molding, in particular to a powder injection molding method of an ultrathin-wall honeycomb-shaped product.
Background
The current demand of ultra-thin wall honeycomb and similar products is more and more extensive, and the product is not only required to be light and thin but also has further improvement on the requirement of high strength performance on the basis of ultra-thin. The traditional honeycomb product is spliced by stamping, so that the reliability and the strength are extremely poor, and the yield is very low when an ultrathin wall product is prepared. The traditional aluminum alloy extrusion technology is adopted, products with thick wall thickness can be extruded, the difficulty is high for products with ultra-thin wall thickness, for example, the wall thickness is lower than 0.5mm, and the performance of the aluminum alloy product prepared by the traditional aluminum alloy extrusion technology is poor.
Disclosure of Invention
In order to solve the technical problem in the prior art, the invention provides a powder injection molding method of an ultrathin-wall honeycomb product.
The application provides a powder injection molding method of an ultrathin-wall honeycomb-shaped product, which comprises the following steps:
s1, feed preparation: mixing and banburying metal powder or ceramic powder, a binder and a lubricant according to a certain proportion, and extruding and granulating by a granulator after banburying to obtain feed particles;
s2, injection molding: heating the feed particles in an injection molding device to a molten state, extruding the feed into a product mold cavity, and taking out after cooling to obtain a honeycomb product part green body with an ultrathin wall;
the green honeycomb article part includes a porous honeycomb structure and a flat flow guide portion; the flow guide part is positioned at one end of the porous honeycomb structure, and the flat-plate flow guide part is vertical to the holes of the honeycomb structure;
s3, degreasing and sintering: removing the glue injection port from the green body of the honeycomb product part, and then degreasing and sintering;
in the degreasing and sintering process of the green body of the honeycomb product part, the flat-plate-shaped flow guide part is used as a sintering support part;
and S4, removing the flat flow guide part.
As a further improvement, in the step S2, during injection molding, the mold has a multi-point glue inlet structure, and the glue inlet is located on the flat flow guide portion.
As a further improvement, the mold has a plurality of cores at positions corresponding to the cells of the honeycomb structure; the mold core is fixed on the rear mold, the mold core sequentially penetrates through the holes with the honeycomb structure and the flat-shaped flow guide part, and the front end part of the mold core is abutted against the front mold.
As a further improvement, in step S3, the green part is subjected to acid stripping, then is sintered at 1350 ℃ -1380 ℃ under heat preservation, and then is subjected to solid solution.
As a further improvement, in step S1, the binder is a thermoplastic, and during the mixing and banburying process, a lubricant is further added.
As a further improvement, in step S1, the metal powder or ceramic powder is first heated in an internal mixer, when the temperature rises to a certain temperature, the binder and the lubricant are then added, and the mixture is sheared and stirred in the internal mixer to be fully mixed, and then the mixture is granulated.
As a further improvement, the metal powder comprises M300 powder.
As a further improvement, the thermoplastic includes polyoxymethylene, low density polyethylene, and polypropylene.
As a further improvement, the wall thickness of the ultra-thin wall honeycomb product is 0.2-0.5 mm.
As a further improvement, the thickness of the flat flow guide part is 0.5-5 mm.
The invention has the following beneficial effects:
by the method, ultra-thin wall honeycomb-shaped products or products with similar structures can be realized;
according to the method, the ultra-thin wall honeycomb-shaped product is prepared by the powder injection molding technology, so that the ultra-thin special-shaped part can be prepared, the extremely high cost advantage is achieved in the aspect of mass production of the three-dimensional complex-shaped part, the product quality is stable, the size precision is high, and the method is widely applied to various fields;
in the application, during injection molding, a green honeycomb product part blank comprising a porous honeycomb structure and a flat flow guide part is prepared; the guide plane is introduced during injection molding, so that the injection molding resistance is low; when the product part green compact is placed in the catalytic degreasing furnace, the flat-plate-shaped flow guide part serves as a sintering support part, so that the product part green compact is prevented from generating large deformation in the sintering process; finally, the flat-shaped flow guide part is removed.
Drawings
FIG. 1 is a schematic structural view of an ultra-thin wall honeycomb product of the present application;
FIG. 2 is a top view of a die for an ultra-thin wall honeycomb product;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at B;
FIG. 5 is a cross-sectional view of a green part of an ultra-thin wall honeycomb product obtained after injection molding;
fig. 6 is a cross-sectional view of the ultra-thin wall honeycomb product with the flat flow guides removed.
The attached drawings are marked as follows:
the honeycomb product comprises a honeycomb product 10, a porous honeycomb structure 11, a flat flow guide part 12, an upper die 20, a lower die 30, a die core 40 and a glue inlet 50.
Detailed Description
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
Unless otherwise defined, terms used in the present specification have the same meaning as those generally understood by those skilled in the art, but in case of conflict, the definitions in the present specification shall control.
The use of "including," "comprising," "containing," "having," or other variations thereof herein, is meant to encompass the non-exclusive inclusion, as such terms are not to be construed. The term "comprising" means that other steps and ingredients can be added that do not affect the end result. The term "comprising" also includes the terms "consisting of …" and "consisting essentially of …". The compositions and methods/processes of the present invention comprise, consist of, and consist essentially of the essential elements and limitations described herein, as well as any of the additional or optional ingredients, components, steps, or limitations described herein.
All numbers or expressions referring to quantities of ingredients, process conditions, etc. used in the specification and claims are to be understood as modified in all instances by the term "about". All ranges directed to the same component or property are inclusive of the endpoints, and independently combinable. Because these ranges are continuous, they include every value between the minimum and maximum values. It should also be understood that any numerical range recited herein is intended to include all sub-ranges within that range.
The present invention provides a powder injection molding method for an ultra-thin wall honeycomb product 10.
The ultra-thin walled honeycomb product 10 is porous in cross-section and has a relatively thin wall thickness. An ultra-thin wall honeycomb product 10 is shown in fig. 1, with the cross-section of the cells being honeycomb. It will be understood, however, that the ultra-thin walled honeycomb product 10 is not limited to having a hexagonal cell cross-section, but may be a product of similar construction, such as a porous product having a uniform two-dimensional cross-section with a pentagonal or irregular polygonal cell cross-section.
A powder injection molding method of an ultra-thin wall honeycomb product 10 of the present application includes the steps of:
s1, feed preparation: mixing and banburying metal powder or ceramic powder, a binder and a lubricant according to a certain proportion, and extruding and granulating by a granulator after banburying to obtain feed particles;
s2, injection molding to obtain a honeycomb product 10 part green body with an ultrathin wall;
s3, degreasing and sintering;
this application, prepare ultra-thin wall honeycomb product 10 through powder injection molding technique, powder injection molding technique has fused plastics injection moulding and metal or ceramic powder metallurgy technique and has developed a technique, traditional powder metallurgy's formation restriction has been broken through, compare with the mode and traditional aluminum alloy extrusion mode of punching press concatenation, not only can prepare ultra-thin special-shaped part, there is high cost advantage in the aspect of the mass production of three-dimensional complicated shape part, can prepare special-shaped part, and its product quality is stable, size precision is high, all have extensive application in each field.
In the present embodiment, in the step S2 of injection molding, the mold is designed as shown in fig. 2 to 3, so that the green part of the honeycomb product 10 includes the porous honeycomb structure 11 and the flat flow-guide portion 12, as shown in fig. 4 and 5. Wherein, the flow guide part is positioned at one end of the porous honeycomb structure 11, and the flat plate-shaped flow guide part 12 is perpendicular to the pores of the honeycomb structure.
Since the wall thickness of the honeycomb article 10 is very thin, 0.2-0.5mm, the resistance is large during the injection molding process. In the present application, by introducing the flat-shaped flow guide part 12 shown in fig. 5, in the injection molding process, the molten feed flows through the cavity corresponding to the flat-shaped flow guide part 12 in the mold first and then flows into the product thin-wall cavity in the mold, and the cavity corresponding to the flat-shaped flow guide part 12 is used as a flow guide plane, and the sectional area is large, so the resistance is small; it is possible to avoid the partial walls of the green body of the part of the honeycomb product 10 not being completely filled and to avoid the high requirements on the injection machine and the injection mold due to the increased injection pressure for better filling.
In step S3, when the green honeycomb product 10 is degreased and sintered, the thickness of the ultra-thin honeycomb product 10 is thin, so that the green honeycomb product is likely to be deformed during sintering, and particularly the support portion of the green honeycomb product is more likely to be deformed. In the present application, the flat plate-shaped deflector 12 is used as the support portion. By using the flat flow guide 12 as a sintering support, the ultra-thin wall honeycomb product 10 can be prevented from being largely deformed during sintering.
The powder injection molding method of an ultra-thin wall honeycomb product 10 of the present application further includes step S4: the flat flow guide part 12 is removed.
In step S4, after the product is shaped, the flat flow guide portions 12 are removed, and after the flat flow guide portions 12 are removed, the honeycomb product 10 is as shown in fig. 6.
The resulting feedstock, including binder, is prepared in step S1. The binder of the embodiment of the application is thermoplastic plastic, has good melt flowability and can increase the flowability of the feed. In the mixing and banburying process, a lubricant is also added.
In the preparation of the feed, the metal powder or the ceramic powder is firstly placed in an internal mixer for heating, when the temperature is raised to a certain temperature, the binder and the lubricant are added, and the mixture is sheared and stirred in the internal mixer for fully mixing, and then granulation is carried out.
In the aspect of feeding, the proportion of the raw materials can be adjusted to adjust the shrinkage ratio, so that the proportion of the binder can be increased, and the flowability of the feed can be increased.
The binder includes polyoxymethylene, low density polyethylene, and polypropylene, and may be mixed from these materials.
The feed material can be prepared by adopting metal powder or ceramic powder.
The metal powder can be high-strength stainless steel powder material with high strength performance such as M300 powder, and the strength of the whole honeycomb product can be ensured. The mass percentage of the M300 powder in the feed is 80-90%.
If ceramic powder is used for feeding preparation, the ceramic powder can be used for ultra-thin wall honeycomb-shaped ceramic products, and the mass percentage of the ceramic powder in the feeding is 75-85%.
In injection molding, the feedstock is injected into the cavity of a product mold at a temperature and pressure using an injection molding apparatus, such as an injection molding machine.
The mould is designed to be a multipoint glue inlet structure, the glue inlet 50 is positioned on the flat flow guide part 12, so that the molten feed firstly flows through a cavity corresponding to the flat flow guide part 12 in the mould and then flows into a product thin-wall cavity in the mould, and the cavity corresponding to the flat flow guide part 12 is used as a flow guide plane, thereby promoting the balance of glue inlet and reducing the injection pressure. The thickness of the flat flow guide part 12 is preferably 0.5 to 5 mm.
The mold comprises an upper mold 20 and a lower mold 30. The mold also has a plurality of mold cores 40 at positions corresponding to the cells of the honeycomb structure. The mold core 40 is used to form the cells of the honeycomb article 10 part during the injection molding process.
In this application, the mold core 40 is fixed at the back mould, and after the mold core 40 passed the hole of honeycomb structure, the flat water conservancy diversion portion 12 in proper order, the mold core 40 front end portion supported at the front mould. The mold core 40 is fixed at both ends thereof to the thick mold and the front mold, respectively, so that the strength of the mold can be further improved.
Degreasing and sintering; since the green article contains a certain proportion of plastic, in order to obtain a near densified metal or ceramic article, the plastic needs to be removed, a process known as degreasing. The degreasing method is different according to the added plastic. Most of the plastic can be removed after degreasing treatment, and only a small amount of plastic remains for maintaining the shape of the green body. And transferring the degreased green body into a sintering furnace, and activating atoms among the powders by a heating method to realize diffusion and migration so as to reach the level of metallurgical bonding among the powders, thereby obtaining the required performance of the product.
Specifically, the green body of the honeycomb product 10 part can be placed into a catalytic degreasing furnace for catalytic degreasing after the glue injection port is removed.
During degreasing and sintering, the green part is subjected to acid removal, then high-temperature heat preservation sintering and solid solution.
Further, after the product is shaped and the flat flow guide portions 12 are removed, aging treatment is performed to obtain the high-strength honeycomb product 10.
Example 1
A powder injection molding method of an ultra-thin wall honeycomb product 10 of the present embodiment includes the steps of:
s1, feed preparation: heating M300 powder in an internal mixer, and adding Polyformaldehyde (POM), low-density polyethylene (LDPE), polypropylene (PP) and a small amount of lubricant when the temperature is raised to 200 ℃; shearing and stirring in an internal mixer for 2 hours to fully homogenize the mixture; then, carrying out extrusion granulation on a granulator to obtain the required feed;
s2, injection molding: adding the feed obtained in the step into a hopper of injection molding equipment, and setting the temperature of a mold to be 135 ℃ and the temperature of the feed to be 210 ℃; the injection pressure is 250Mpa, the feeding particles are heated to a molten state in the injection molding equipment, then are extruded into a product mold cavity through a plunger or a screw, and are taken out after being cooled, so as to obtain a green body of the 10 parts of the honeycomb product with the ultrathin wall;
the green honeycomb article 10 part includes a porous honeycomb structure 11 and a plate-like flow guide 12.
S3, degreasing and sintering: removing the glue opening of the green body of the product part, flattening, placing the plane of the flat flow guide part 12 on a ceramic plate, performing acid stripping, preserving heat at 1350-1380 ℃ for 6H, and performing solid solution to obtain a honeycomb-shaped part.
S4, shaping: after the product is shaped, the flat flow guide part 12 is removed; and finally, carrying out aging treatment.
An ultra-thin high strength M300 honeycomb article 10 may be obtained by the above method.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A powder injection molding method of an ultra-thin wall honeycomb product, comprising the steps of:
s1, feed preparation: mixing and banburying metal powder or ceramic powder with a binder and a lubricant, and extruding and granulating by a granulator after banburying to obtain feed particles;
s2, injection molding to obtain a honeycomb product part green body with an ultrathin wall;
the green honeycomb article part includes a porous honeycomb structure and a flat flow guide portion; the flow guide part is positioned at one end of the porous honeycomb structure, and the flat-plate flow guide part is vertical to the holes of the honeycomb structure;
s3, degreasing and sintering;
in the degreasing and sintering process of the green body of the honeycomb product part, the flat-plate-shaped flow guide part is used as a sintering support part;
and S4, removing the flat flow guide part.
2. The method of powder injection molding of ultra-thin wall honeycomb product as claimed in claim 1, wherein the mold is a multi-point glue injection structure and the glue inlet is located on the flat flow guide part at the step of S2 injection molding.
3. The method of powder injection molding an ultra-thin wall honeycomb product as claimed in claim 2 wherein the mold has a plurality of cores at positions corresponding to the cells of the honeycomb structure; the mold core is fixed on the rear mold, the mold core sequentially penetrates through the holes with the honeycomb structure and the flat-shaped flow guide part, and the front end part of the mold core is abutted against the front mold.
4. The method for powder injection molding of ultra-thin walled honeycomb product as claimed in claim 1 wherein in step S3, the green part is acid stripped, sintered at 1350 ℃ -1380 ℃ under heat preservation, and then solid-solubilized.
5. The method of claim 1, wherein in step S1, the binder is a thermoplastic and a lubricant is added during the mixing and banburying process.
6. The method of claim 4, wherein the metal powder or the ceramic powder is heated in an internal mixer, and when the temperature is raised to a certain temperature, the binder and the lubricant are added, and then the mixture is sheared and stirred in the internal mixer to be mixed thoroughly, and then the mixture is granulated.
7. The method of powder injection molding an ultra-thin wall honeycomb product as claimed in claim 1 wherein the metal powder comprises a high strength stainless steel powder.
8. The method of powder injection molding an ultra-thin wall cellular product as claimed in claim 5 wherein the thermoplastic comprises polyoxymethylene, low density polyethylene, and polypropylene.
9. The method of powder injection molding an ultra-thin walled honeycomb product as claimed in claim 1 wherein the ultra-thin walled honeycomb product has a wall thickness of 0.2-0.5 mm.
10. The method of powder injection molding of ultra-thin wall honeycomb product as claimed in claim 1, wherein the flat plate-like flow guide has a thickness of 0.5-5 mm.
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2020
- 2020-12-23 CN CN202011542932.0A patent/CN112589955A/en active Pending
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|---|---|---|---|---|
| JPH06126853A (en) * | 1992-10-21 | 1994-05-10 | Hirokazu Dezuki | Production of honeycomb structure |
| US20050064221A1 (en) * | 2001-05-14 | 2005-03-24 | Lu Jyh-Woei J. | Sintering process and tools for use in metal injection molding of large parts |
| CN105108154A (en) * | 2015-09-21 | 2015-12-02 | 深圳艾利门特科技有限公司 | Method for preparing special-shaped complex part through powder injection molding technology |
| CN107573061A (en) * | 2017-08-25 | 2018-01-12 | 南通通州湾新材料科技有限公司 | The manufacture method of honeycomb blind hole toughened zirconium oxide ceramic shell and its application |
| CN208006153U (en) * | 2018-03-13 | 2018-10-26 | 广州市旭胜模具有限公司 | A kind of upper-lower casing closes mold with lay wire |
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