CN111136275A - Method for preparing large-area thin-wall part by injection molding - Google Patents
Method for preparing large-area thin-wall part by injection molding Download PDFInfo
- Publication number
- CN111136275A CN111136275A CN202010066573.XA CN202010066573A CN111136275A CN 111136275 A CN111136275 A CN 111136275A CN 202010066573 A CN202010066573 A CN 202010066573A CN 111136275 A CN111136275 A CN 111136275A
- Authority
- CN
- China
- Prior art keywords
- temperature
- injection
- powder
- cavity
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62218—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic films, e.g. by using temporary supports
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6022—Injection moulding
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
Abstract
The invention relates to a method for preparing a large-area thin-wall part by injection molding, which comprises the following steps: A. preparing a feed; B. and (3) injection: adding the feed into a charging barrel of an injection machine, filling the molten feed into a cavity of a mold through the injection machine, and then cooling and demolding to obtain an injection blank; the temperature of the cavity of the die is controlled by a rapid cooling system as follows: in the filling process, the temperature of the mould is consistent with the discharging temperature of the injection machine; after filling, quickly cooling the temperature of the mold to the demolding temperature; C. catalytic degreasing: carrying out catalytic degreasing on the injection blank to obtain a degreased blank; D. and (5) sintering. The invention can quickly heat the die to the same temperature as the feeding material in the feeding and filling process, thereby ensuring that the feeding material can be filled for a longer distance; after filling, in order to ensure that the product has sufficient strength and is easy to demold, the mold needs to be cooled down quickly. Thereby making it possible to prepare large-area thin-wall products and even film materials.
Description
Technical Field
The invention relates to powder injection molding, in particular to a method for preparing a large-area thin-wall part by injection molding.
Background
Powder injection molding is a novel powder metallurgy near-net shape molding technology and can be used for producing structural parts with high density, high precision and three-dimensional complex shapes in large batches. However, this process has some drawbacks in product design, i.e., it cannot produce a product with a large area and a thin wall thickness. Because the mold is typically heated to 100-. Therefore, the wall thickness of the product formed by powder injection molding is more than or equal to 0.3mm, and the area of the product is less than or equal to 20cm 2.
With the increasing requirements of end products on functions and appearance, more and more structural parts need to have thinner thickness and larger area, and the existing powder injection molding process and equipment cannot meet the production requirements. In particular to the preparation of the product with the wall thickness less than 0.3mm and the area more than or equal to 50cm2The existing powder injection molding process of the workpiece can not meet the requirements.
Disclosure of Invention
The invention aims to provide a method for preparing a large-area thin-walled part by injection molding, which can be used for preparing the large-area thin-walled part
The technical scheme for realizing the purpose of the invention is as follows: the invention comprises the following steps:
A. preparing a feed: mixing the powder and a binder according to a certain proportion, and preparing a feed through mixing and granulation;
B. and (3) injection: adding the feed into a charging barrel of an injection machine, filling the molten feed into a cavity of a mold through the injection machine, and then cooling and demolding to obtain an injection blank; the temperature of the cavity of the die is controlled by a rapid cooling and rapid heating system as follows: in the filling process, the temperature of the cavity of the mold is consistent with the discharging temperature of the injection machine; after the filling is finished, the temperature of the cavity of the mold is quickly reduced to the demolding temperature;
C. catalytic degreasing: carrying out catalytic degreasing on the injection blank to obtain a degreased blank;
D. and (3) sintering: and sintering the degreased blank in a sintering furnace to obtain a finished product.
The powder in step a above is any ceramic powder or metal powder suitable for use in an injection molding process.
The binder in the step A is a POM system.
The powder and the binder in the step A are in proportion as follows: when the powder is metal powder, the ratio of the metal powder to the binder is (8.5-9.2): 1; when the powder is ceramic powder, the ratio of the ceramic powder to the binder is (7.5-8.5): 1.
And C, catalyzing and removing the binder by adopting nitric acid with the concentration of more than or equal to 98% at the temperature of 110 +/-10 ℃ to obtain a degreased blank.
The rapid cooling and heating system comprises a high-frequency heating device and a liquid nitrogen cooling device; the high-frequency heating device comprises an alternating current controller and a closed induction coil; the liquid nitrogen cooling device comprises a liquid nitrogen source, a gasification device, an air inlet pipe and an air outlet pipe; a cold channel is arranged in the mould; the closed induction coil is embedded in the mold and surrounds the outside of the cavity; the closed induction coil is electrically connected with the alternating current controller; the liquid nitrogen source is connected with an inlet of the gasification device, an outlet of the gasification device is connected and communicated with one end of the air inlet pipe, the other end of the air inlet pipe is connected and communicated with one end of the cold channel, the other end of the cold channel is connected with one end of the air outlet pipe, and the other end of the air outlet pipe is directly communicated with the outdoor environment.
To ensure cooling efficiency, a cooling channel is arranged around the cavity.
The working principle of the high-frequency heating device is as follows: when alternating current flows in the closed induction coil, a changing magnetic field is generated around the closed induction coil, and because the die is made of steel and belongs to ferromagnetic substances, the changing magnetic field generates eddy current in the die, so that the die generates heat. Due to the skin effect, most of generated heat can be concentrated on the surface layer of the die, so that the temperature of the surface layer of the die can be increased rapidly, the effect of heating the die cavity rapidly is achieved, and the heating efficiency is adjusted by adjusting the frequency of alternating current and the number of turns of the closed induction coil.
The principle of the liquid nitrogen cooling device is that the heat of the die is taken away by low-temperature gas after liquid nitrogen gasification. The high-frequency heating device and the liquid nitrogen cooling system are respectively connected with the injection machine through sensors, and when a mold closing signal is received, the heating system is automatically started, and the cooling system is automatically stopped; and when the mold opening signal is received, the heating is automatically stopped, and the cooling system is started. The automatic control is a basic theory of mechanical automatic control, and will not be described in detail, and even if not described in detail, the specific setting mode and control mode can be known by those skilled in the art through the above description.
When the powder is TC4 powder and the binder is a POM system, the mass ratio of the TC4 powder to the binder is 8.5: 1; step B, firstly heating the temperature of the cavity of the mold to 190 ℃ by using a high-frequency heating device, and then injecting the molten feed into the cavity of the mold by using an injection machine; then, rapidly cooling the cavity of the mold to the demolding temperature by using a liquid nitrogen cooling device; finally, demoulding to obtain an injection blank; step C, catalytically removing the binder from the injection blank at the temperature of 110 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 60min, and finally obtaining a degreased blank; and D, sintering the degreased blank under a high vacuum condition, wherein the heat preservation temperature is 1200 ℃, and the heat preservation time is 180 min.
When the powder is 316 stainless steel powder and the binder is a POM system, the mass ratio of the 316 stainless steel powder to the binder is 9: 1; b, heating the cavity of the mold to 180 ℃ by using a high-frequency heating device, and injecting and filling the molten feed into the cavity of the mold by using an injection machine; then, rapidly cooling the cavity of the mold to the demolding temperature by using a liquid nitrogen cooling device; finally, demoulding to obtain an injection blank; step C, catalytically removing the binder from the injection blank at the temperature of 115 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 120min, and finally obtaining a degreased blank; and D, sintering the degreased blank in a hydrogen atmosphere, wherein the heat preservation temperature is 1350 ℃, and the heat preservation time is 180 min.
When the powder is zirconia powder and the binder is a POM system, the mass ratio of the zirconia powder to the binder is 7.5: 1; b, heating the cavity of the mold to 180 ℃ by using a high-frequency heating device, and injecting and filling the molten feed into the cavity of the mold by using an injection machine; then, rapidly cooling the cavity of the mold to the demolding temperature by using a liquid nitrogen cooling device; finally, demoulding to obtain an injection blank; step C, catalytically removing the binder from the injection blank at the temperature of 110 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 180min, and finally obtaining a degreased blank; and D, sintering the degreased blank in the air, wherein the heat preservation temperature is 1400 ℃, and the heat preservation time is 120 min.
The invention has the positive effects that: (1) the invention can rapidly heat the die to the same temperature as the feeding material in the feeding and filling process through the rapid cooling and rapid heating system, thereby ensuring that the feeding material can be filled for a longer distance; after filling, in order to ensure that the product has sufficient strength and is easy to demold, the mold needs to be cooled down quickly. Thereby making it possible to prepare large-area thin-wall products and even film materials.
(2) The invention applies the high-frequency heating device used in the field of melting and the liquid nitrogen cooling device used in the field of freeze thawing to the field of powder injection, can effectively break through the problems of insufficient heating temperature and insufficient cooling speed in the prior art, and thoroughly provides favorable conditions for powder injection of thin workpieces.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic structural diagram of a rapid cooling and heating system and an injection machine according to the present invention;
FIG. 2 is a perspective view of the rapid cooling and heating system of the present invention on a mold.
Detailed Description
Referring to fig. 1 and 2, the rapid cooling and heating system 2 of the present invention includes a high-frequency heating device 21 and a liquid nitrogen cooling device 22; the high-frequency heating apparatus 21 includes an alternating current controller 211 and a closed induction coil 212; the liquid nitrogen cooling device 22 comprises a liquid nitrogen source 221, a gasification device 222, an air inlet pipe 223 and an air outlet pipe 224; a cold channel 12 is arranged in the mould 1; the closed induction coil 212 is embedded in the mold 1 and surrounds the outside of the cavity 11; the closed induction coil 212 is electrically connected with an alternating current controller 211; the liquid nitrogen source 221 is connected with an inlet of the gasification device 222, an outlet of the gasification device 222 is connected and communicated with one end of an air inlet pipe 223, the other end of the air inlet pipe 223 is connected and communicated with one end of the cold channel 12, the other end of the cold channel 12 is connected with one end of an air outlet pipe 224, and the other end of the air outlet pipe 224 is directly communicated with the outdoor environment. The cooling channel 12 is enclosed outside the cavity 11. The positions of the cold channel 12 and the closed induction coil 212 in fig. 2 are only used for reference, and the distribution design can be performed according to the situation, and the design can be obtained by designing according to the warming efficiency and the cooling efficiency by a person skilled in the art.
(example 1)
The invention prepares a titanium film with the thickness of 200 multiplied by 150 multiplied by 0.15mm, which comprises the following steps:
A. preparing a feed: mixing TC4 powder and a binder according to a mass ratio of 8.5:1, and mixing and granulating to prepare feed particles;
B. and (3) injection: when a mold closing signal is received, the temperature of a cavity 11 of the mold 1 is rapidly heated to 190 ℃ under the action of an alternating current controller 211 and a closed induction coil 212; then the molten feed is injected and filled into the cavity 11 of the mold 1 by the injection machine 3; when a die opening signal is received, the high-frequency heating device 21 is automatically stopped, the liquid nitrogen cooling device 22 is automatically started, and the temperature of the cavity 11 of the die 1 is rapidly cooled to the demolding temperature under the action of liquid nitrogen; finally, demoulding to obtain an injection blank;
C. catalytic degreasing: catalyzing and removing the binder from the injection blank at the temperature of 110 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 60min, and finally obtaining a degreased blank;
D. and (3) sintering: sintering the degreased blank under the high vacuum condition, wherein the heat preservation temperature is 1200 ℃, and the heat preservation time is 180min, and finally obtaining a finished product.
(example 2)
The invention relates to a 316 stainless steel sheet with the thickness of 150 multiplied by 100 multiplied by 0.2mm, which comprises the following steps:
A. preparing a feed: mixing 316 stainless steel powder and a binder according to a mass ratio of 9:1, and mixing and granulating to prepare feed particles;
B. and (3) injection: when a mold closing signal is received, the temperature of the cavity 11 of the mold 1 is rapidly heated to 180 ℃ under the action of the alternating current controller 211 and the closed induction coil 212; then the molten feed is injected and filled into the cavity 11 of the mold 1 by the injection machine 3; when a die opening signal is received, the high-frequency heating device 21 is automatically stopped, the liquid nitrogen cooling device 22 is automatically started, and the temperature of the cavity 11 of the die 1 is rapidly cooled to the demolding temperature under the action of liquid nitrogen; finally, demoulding to obtain an injection blank;
C. catalytic degreasing: catalyzing and removing the binder from the injection blank at the temperature of 115 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 120min, and finally obtaining a degreased blank;
D. and (3) sintering: sintering the degreased blank in hydrogen atmosphere, keeping the temperature at 1350 ℃ for 180min, and finally obtaining a finished product.
(example 3)
The invention relates to a porous zirconia ceramic membrane with the thickness of 180 multiplied by 120 multiplied by 0.2mm, which comprises the following steps:
A. preparing a feed: mixing zirconia powder and a binder according to a mass ratio of 7.5:1, and mixing and granulating to prepare feed particles;
B. and (3) injection: when a mold closing signal is received, the temperature of the cavity 11 of the mold 1 is rapidly heated to 180 ℃ under the action of the alternating current controller 211 and the closed induction coil 212; then the molten feed is injected and filled into the cavity 11 of the mold 1 by the injection machine 3; when a die opening signal is received, the high-frequency heating device 21 is automatically stopped, the liquid nitrogen cooling device 22 is automatically started, and the temperature of the cavity 11 of the die 1 is rapidly cooled to the demolding temperature under the action of liquid nitrogen; finally, demoulding to obtain an injection blank;
C. catalytic degreasing: catalyzing and removing the binder from the injection blank at the temperature of 110 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 180min, and finally obtaining a degreased blank;
D. and (3) sintering: sintering the degreased blank in the air, wherein the heat preservation temperature is 1400 ℃, and the heat preservation time is 120min, and finally obtaining a finished product.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for preparing a large-area thin-walled part by injection molding; the method is characterized by comprising the following steps:
A. preparing a feed: mixing the powder and a binder according to a certain proportion, and preparing a feed through mixing and granulation;
B. and (3) injection: adding the feed into a charging barrel of an injection machine (3), filling the molten feed into a cavity (11) of a mold (1) through the injection machine (3), and then cooling and demolding to obtain an injection blank; the temperature of a cavity (11) of the die (1) is controlled by a rapid cooling and rapid heating system (2) as follows: in the filling process, the temperature of a cavity (11) of the mold (1) is kept consistent with the discharging temperature of the injection machine (3); after the filling is finished, the temperature of the cavity (11) of the mold (1) is quickly reduced to the demolding temperature;
C. catalytic degreasing: carrying out catalytic degreasing on the injection blank to obtain a degreased blank;
D. and (3) sintering: and sintering the degreased blank in a sintering furnace to obtain a finished product.
2. The method of injection molding to produce a large area, thin-walled part of claim 1, wherein: the powder in step a is any ceramic powder or metal powder suitable for use in an injection molding process.
3. The method of injection molding to produce a large area, thin-walled part of claim 1, wherein: the binder in the step A is a POM system.
4. The method of injection molding to produce a large area, thin-walled part of claim 1, wherein: the ratio of the powder to the binder in the step A is as follows: when the powder is metal powder, the ratio of the metal powder to the binder is (8.5-9.2): 1; when the powder is ceramic powder, the ratio of the ceramic powder to the binder is (7.5-8.5): 1.
5. The method of injection molding to produce a large area, thin-walled part of claim 1, wherein: and step C, catalyzing and removing the binder by adopting nitric acid with the concentration of more than or equal to 98% at the temperature of 110 +/-10 ℃ to obtain a degreased blank.
6. The method of injection molding to produce a large area, thin-walled part of claim 1, wherein: the rapid cooling and heating system (2) comprises a high-frequency heating device (21) and a liquid nitrogen cooling device (22); the high-frequency heating apparatus (21) includes an alternating current controller (211) and a closed induction coil (212); the liquid nitrogen cooling device (22) comprises a liquid nitrogen source (221), a gasification device (222), an air inlet pipe (223) and an air outlet pipe (224); a cold channel (12) is arranged in the die (1); the closed induction coil (212) is embedded in the die (1) and surrounds the outside of the cavity (11); the closed induction coil (212) is electrically connected with an alternating current controller (211); the liquid nitrogen source (221) is connected with an inlet of the gasification device (222), an outlet of the gasification device (222) is communicated with one end of an air inlet pipe (223), the other end of the air inlet pipe (223) is communicated with one end of the cold channel (12), the other end of the cold channel (12) is connected with one end of an air outlet pipe (224), and the other end of the air outlet pipe (224) is directly communicated with the outdoor environment.
7. An injection molding method of making a large area, thin walled part according to claim 6, wherein: the powder is TC4 powder, the binder is a POM system, and the mass ratio of the TC4 powder to the binder is 8.5: 1;
the step B is that the temperature of the cavity (11) of the mould (1) is heated to 190 ℃ by a high-frequency heating device (21), and then the molten feed is injected and filled in the cavity (11) of the mould (1) by an injection machine (3); then, rapidly cooling the cavity (11) of the mold (1) to the demolding temperature by using a liquid nitrogen cooling device (22); finally, demoulding to obtain an injection blank;
step C, catalytically removing the binder from the injection blank at the temperature of 110 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 60min, and finally obtaining a degreased blank;
and D, sintering the degreased blank under a high vacuum condition, wherein the heat preservation temperature is 1200 ℃, and the heat preservation time is 180 min.
8. An injection molding method of making a large area, thin walled part according to claim 6, wherein: the powder is 316 stainless steel powder, the binder is a POM system, and the mass ratio of the 316 stainless steel powder to the binder is 9: 1;
the step B is that the temperature of the cavity (11) of the mould (1) is heated to 180 ℃ by a high-frequency heating device (21), and then the molten feed is injected and filled in the cavity (11) of the mould (1) by an injection machine (3); then, rapidly cooling the cavity (11) of the mold (1) to the demolding temperature by using a liquid nitrogen cooling device (22); finally, demoulding to obtain an injection blank;
step C, catalytically removing the binder from the injection blank at the temperature of 115 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 120min, and finally obtaining a degreased blank;
and D, sintering the degreased blank in a hydrogen atmosphere, wherein the heat preservation temperature is 1350 ℃, and the heat preservation time is 180 min.
9. An injection molding method of making a large area, thin walled part according to claim 6, wherein: the powder is zirconia powder, the binder is a POM system, and the mass ratio of the zirconia powder to the binder is 7.5: 1;
the step B is that the temperature of the cavity (11) of the mould (1) is heated to 180 ℃ by a high-frequency heating device (21), and then the molten feed is injected and filled in the cavity (11) of the mould (1) by an injection machine (3); then, rapidly cooling the cavity (11) of the mold (1) to the demolding temperature by using a liquid nitrogen cooling device (22); finally, demoulding to obtain an injection blank;
step C, catalytically removing the binder from the injection blank at the temperature of 110 ℃ by using nitric acid with the concentration of more than or equal to 98 percent, wherein the acid introduction time is 180min, and finally obtaining a degreased blank;
and D, sintering the degreased blank in the air, wherein the heat preservation temperature is 1400 ℃, and the heat preservation time is 120 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010066573.XA CN111136275A (en) | 2020-01-20 | 2020-01-20 | Method for preparing large-area thin-wall part by injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010066573.XA CN111136275A (en) | 2020-01-20 | 2020-01-20 | Method for preparing large-area thin-wall part by injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111136275A true CN111136275A (en) | 2020-05-12 |
Family
ID=70526433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010066573.XA Pending CN111136275A (en) | 2020-01-20 | 2020-01-20 | Method for preparing large-area thin-wall part by injection molding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111136275A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111647826A (en) * | 2020-06-15 | 2020-09-11 | 江苏精研科技股份有限公司 | Method for preparing antibacterial stainless steel by adopting powder injection molding process |
| CN112756611A (en) * | 2021-01-29 | 2021-05-07 | 余康康 | Chemical metal powder injection molding device |
| CN113547698A (en) * | 2021-07-29 | 2021-10-26 | 南京工程学院 | Electric heating and liquid nitrogen cooling's no trace injection mould of highlight |
| CN114434596A (en) * | 2021-12-22 | 2022-05-06 | 萍乡市慧成精密机电有限公司 | Manufacturing method of ceramic injection molding shifting fork |
| CN115044793A (en) * | 2022-06-16 | 2022-09-13 | 江苏精研科技股份有限公司 | Manufacturing method for preparing two-phase high-entropy alloy by adopting powder injection molding |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0701875A1 (en) * | 1994-09-15 | 1996-03-20 | Basf Aktiengesellschaft | Process for preparing metallic articles by injection moulding |
| JPH08216218A (en) * | 1995-02-15 | 1996-08-27 | Mitsui Mining & Smelting Co Ltd | Injection molding method and device thereof |
| US20040041303A1 (en) * | 2002-09-04 | 2004-03-04 | Byung Kim | Method and apparatus for rapid mold heating and cooling |
| JP2008110583A (en) * | 2006-10-31 | 2008-05-15 | Alps Electric Co Ltd | Injection molding machine and injection molding method |
| CN102091757A (en) * | 2010-12-30 | 2011-06-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Integral precision casting method for large thin-wall casing part |
| CN103878372A (en) * | 2013-12-25 | 2014-06-25 | 华侨大学 | Method of manufacturing metal parts having geometric structures such as thin wall or thin groove |
| CN105234417A (en) * | 2014-06-27 | 2016-01-13 | 南京益佳特科技发展有限公司 | Manufacturing method for thin-wall medical parts |
| CN106738737A (en) * | 2016-12-12 | 2017-05-31 | 南通理工学院 | The injection molding forming method of Thin Wall Plastic Parts |
| CN109648771A (en) * | 2019-01-29 | 2019-04-19 | 金雨谷 | A kind of speed heat of high molecular material foaming, fast-cooling system |
| CN110125418A (en) * | 2019-07-03 | 2019-08-16 | 江苏精研科技股份有限公司 | A kind of MIM titanium alloy preparation method improving surface abrasion resistance |
| CN110480016A (en) * | 2019-09-17 | 2019-11-22 | 江苏精研科技股份有限公司 | A method of labyrinth function ceramics part is prepared using powder injection-molded |
-
2020
- 2020-01-20 CN CN202010066573.XA patent/CN111136275A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0701875A1 (en) * | 1994-09-15 | 1996-03-20 | Basf Aktiengesellschaft | Process for preparing metallic articles by injection moulding |
| JPH08216218A (en) * | 1995-02-15 | 1996-08-27 | Mitsui Mining & Smelting Co Ltd | Injection molding method and device thereof |
| US20040041303A1 (en) * | 2002-09-04 | 2004-03-04 | Byung Kim | Method and apparatus for rapid mold heating and cooling |
| JP2008110583A (en) * | 2006-10-31 | 2008-05-15 | Alps Electric Co Ltd | Injection molding machine and injection molding method |
| CN102091757A (en) * | 2010-12-30 | 2011-06-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Integral precision casting method for large thin-wall casing part |
| CN103878372A (en) * | 2013-12-25 | 2014-06-25 | 华侨大学 | Method of manufacturing metal parts having geometric structures such as thin wall or thin groove |
| CN105234417A (en) * | 2014-06-27 | 2016-01-13 | 南京益佳特科技发展有限公司 | Manufacturing method for thin-wall medical parts |
| CN106738737A (en) * | 2016-12-12 | 2017-05-31 | 南通理工学院 | The injection molding forming method of Thin Wall Plastic Parts |
| CN109648771A (en) * | 2019-01-29 | 2019-04-19 | 金雨谷 | A kind of speed heat of high molecular material foaming, fast-cooling system |
| CN110125418A (en) * | 2019-07-03 | 2019-08-16 | 江苏精研科技股份有限公司 | A kind of MIM titanium alloy preparation method improving surface abrasion resistance |
| CN110480016A (en) * | 2019-09-17 | 2019-11-22 | 江苏精研科技股份有限公司 | A method of labyrinth function ceramics part is prepared using powder injection-molded |
Non-Patent Citations (3)
| Title |
|---|
| 程继贵等: "《第十五届华东五省一市粉末冶金技术交流会论文集》", 31 October 2014, 合肥工业大学出版社 * |
| 穆阿姆梅尔·科驰: "《微制造 微型产品的设计与制造》", 30 April 2017, 国防工业出版社 * |
| 胡志强: "《环境与可靠性试验应用技术》", 31 August 2016, 中国质检出版社 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111647826A (en) * | 2020-06-15 | 2020-09-11 | 江苏精研科技股份有限公司 | Method for preparing antibacterial stainless steel by adopting powder injection molding process |
| CN112756611A (en) * | 2021-01-29 | 2021-05-07 | 余康康 | Chemical metal powder injection molding device |
| CN113547698A (en) * | 2021-07-29 | 2021-10-26 | 南京工程学院 | Electric heating and liquid nitrogen cooling's no trace injection mould of highlight |
| CN114434596A (en) * | 2021-12-22 | 2022-05-06 | 萍乡市慧成精密机电有限公司 | Manufacturing method of ceramic injection molding shifting fork |
| CN114434596B (en) * | 2021-12-22 | 2023-11-21 | 萍乡市慧成精密机电有限公司 | Manufacturing method of ceramic injection molding shifting fork |
| CN115044793A (en) * | 2022-06-16 | 2022-09-13 | 江苏精研科技股份有限公司 | Manufacturing method for preparing two-phase high-entropy alloy by adopting powder injection molding |
| CN115044793B (en) * | 2022-06-16 | 2023-09-08 | 江苏精研科技股份有限公司 | Manufacturing method for preparing two-phase high-entropy alloy by powder injection molding |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111136275A (en) | Method for preparing large-area thin-wall part by injection molding | |
| CN105563616B (en) | The forming method of zirconia ceramic product | |
| CN103240418B (en) | Near-net shaping method for charging turbine with hollow internal structure | |
| CN103695681B (en) | The shaped device of a kind of aluminum-base silicon carbide particulate reinforced composite and component thereof and method | |
| CN105880589B (en) | A kind of method for sensing ULTRASONIC COMPLEX auxiliary laser metal forming | |
| CN104525953B (en) | Ultrasonic assisted powder injection molding device and method | |
| CN203683638U (en) | Automatic alloy rheological slurry preparing and rheological forming device | |
| CN103949640A (en) | Method for preparing NbSi-base ultrahigh-temperature alloy through EBM (Electron Beam Melting) | |
| CN110343917B (en) | Process and equipment for intermittently preparing liquid high-silicon aluminum alloy or high-silicon aluminum alloy semi-solid slurry | |
| CN109396434A (en) | A method of titanium alloy component is prepared based on selective laser melting process | |
| CN102294478A (en) | Precise spray forming device and method for realizing quick mould manufacturing by same | |
| CN111261398B (en) | Hot pressing device, hot pressing system and preparation method for preparing neodymium iron boron magnetic ring | |
| CN103008601B (en) | Pulse discharge auxiliary die-casting device and method | |
| CN107159887A (en) | A kind of forming method based on microwave adsorption heat-emitting material | |
| Rane et al. | Rapid production of hollow SS316 profiles by extrusion based additive manufacturing | |
| CN105921752A (en) | Method for preparing invar alloy resonance bar | |
| CN104772464B (en) | The preparation method of orthopaedics implant | |
| CN111705234A (en) | Preparation process of high-hardness product | |
| CN107671258A (en) | A kind of vacuum centrifugal casting preparation method of zirconium-base amorphous alloy thin-wall part | |
| CN103521704A (en) | Method for casting blade | |
| JP2000239760A (en) | Apparatus for producing lotus root-shaped porous metal | |
| JPH09324202A (en) | Sintered die for forming and forming thereof | |
| CN103553621B (en) | The preparation method of silicon carbide hydrogen collector | |
| CN111687409B (en) | Near net forming method and subsequent sintering process for titanium and titanium alloy | |
| CN113477922B (en) | Amorphous alloy powder high-density thermoplastic forming method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200512 |
|
| RJ01 | Rejection of invention patent application after publication |