CN110814337A - Simple low-cost cold isostatic pressing die and implementation method thereof - Google Patents
Simple low-cost cold isostatic pressing die and implementation method thereof Download PDFInfo
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- CN110814337A CN110814337A CN201911256808.5A CN201911256808A CN110814337A CN 110814337 A CN110814337 A CN 110814337A CN 201911256808 A CN201911256808 A CN 201911256808A CN 110814337 A CN110814337 A CN 110814337A
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- die
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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
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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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
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
Abstract
The invention discloses a simple low-cost cold isostatic pressing die which comprises a main die, wherein a supporting sealing gasket is arranged at the bottom end inside the main die, a supporting die is connected above the supporting sealing gasket, a plurality of liquid through holes are formed in the side wall of the supporting die, an exhaust pipe communicated with the inside is connected to one side of the bottom of the main die, a charging elastic sealing bag is arranged inside the supporting die, and powder is filled in the charging elastic sealing bag; the invention also discloses a simple low-cost implementation method of the cold isostatic pressing die. The invention does not need to customize a rubber sleeve die, the price of the die material used for manufacturing the invention is very low, the purchase cycle of the material used for manufacturing the die is very short, and the material can be reused; the pressed green body is complete and uniform in density, and has no defects of water inflow, foot falling and the like; the die structure can greatly reduce the die manufacturing cost, shorten the production delivery period of the die, greatly improve the production efficiency and reduce the production cost on the premise of ensuring the quality of pressed blanks.
Description
Technical Field
The invention belongs to the technical field of powder cold isostatic pressing, and particularly relates to a simple low-cost cold isostatic pressing die and an implementation method thereof.
Background
In a huge powder metallurgy market, most of powder metallurgy products are formed by pressing through an alloy steel die, but for some special products, such as products with high requirements on performance and size precision, cold isostatic pressing is generally adopted firstly, and then blank repair is carried out, because the density of a pressed blank formed by the cold isostatic pressing is extremely high, the density of the pressed blank is 5% -10% higher than that of the pressed blank formed by common die pressing, the strength of the pressed blank is 25% -50% higher than that of the pressed blank formed by the die pressing, and the blank repair of the high-precision products is facilitated.
The general cold isostatic mould in the existing market is the gum cover mould, and this type of mould toughness is good, and is durable, but the price is also high, and each gum cover mould all need have the supporting could the preparation of corresponding steel mould, and the preparation cycle is long, this purchase cost and the purchase delivery time that has also greatly increased the enterprise. The die is only suitable for the production of batch products, and the cost of the die and the manufacturing period of the product are more concerned about the products with various specifications and few single-batch orders, so the use of the rubber sleeve die is obviously not suitable.
An improved forming method is disclosed in the prior art, and is disclosed in patent 2017216061019, namely 'a wet trial cold isostatic pressing mold', although the cost of the mold is lower than that of a mold for manufacturing a rubber sleeve, the process for producing products is complicated (at least 5 layers of polyethylene vacuum bags are required for sealing), the production efficiency is not high, and the pressed products have certain limitations, which is very limited by the specification and shape of the polyethylene vacuum bags in the patent, and a core rod cannot be installed, but only solid products can be pressed.
Disclosure of Invention
The invention aims to provide a simple low-cost cold isostatic pressing die to solve the problems in the background technology. The simple low-cost cold isostatic pressing die provided by the invention has the characteristics that a rubber sleeve die does not need to be customized, the price of die materials is very low, the purchase period of materials used for manufacturing the die is very short, and the die can be repeatedly used.
The invention also aims to provide a simple low-cost implementation method of the cold isostatic pressing die.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a simple and easy low-cost cold isostatic mould, includes the master mould, and the inside bottom of master mould is equipped with supports sealed the pad, supports sealed top of filling up and is connected with the support mould, supports and is equipped with a plurality of through-flow hole on the lateral wall of mould, and one side of master mould bottom is connected with the exhaust tube with inside intercommunication, supports the inside of mould and is equipped with the elasticity sealing bag of feeding, and the powder is equipped with in the inside of the elasticity sealing bag of feeding.
In the invention, the opening of the elastic charging sealing bag is sleeved on the outer wall of the main die, and the opening of the elastic charging sealing bag and the main die are fixed through an elastic rope.
Further in the invention, a core rod is placed inside the elastic charging sealing bag.
In the invention, the main mold and the support mold are both PVC water pipe components.
Further in the invention, the diameter of the liquid through hole is 3-5 mm.
Further in the invention, the elastic charging sealing bag is a latex balloon member and has a weight of 8-30 g.
In the invention, the supporting sealing gasket is a silica gel component, the diameter of the supporting sealing gasket is 1-2mm larger than the inner diameter of the main die, and the thickness of the supporting sealing gasket is 20-40 mm.
Further, the method for realizing the simple low-cost cold isostatic pressing mold comprises the following steps:
sleeving a main body of the elastic charging sealing bag in a support die, pulling an opening of the elastic charging sealing bag open, sleeving the opening on the outer wall of a main die, and fixing the opening through an elastic rope;
connecting the air exhaust pipe to an air extractor for air exhaust to form negative pressure among the main die, the support die and the support sealing gasket, so that the elastic charging sealing bag is attached to the inner wall of the support die under the action of atmospheric pressure;
(III) filling the powder into a charging elastic sealing bag, or filling the powder into the charging elastic sealing bag and simultaneously putting the core rod;
after the powder is filled, flattening the powder at the upper opening, then taking down the elastic rope for fixing, and sealing the elastic sealing bag for filling;
taking out the main die, and putting the supporting sealing gasket, the supporting die, the charging elastic sealing bag and powder inside the charging elastic sealing bag into a static press for isostatic pressing;
and (VI) after pressing is finished, loosening the elastic sealing bag for filling, and taking out the pressed blank.
In the invention, the simple low-cost cold isostatic pressing mold is further realized, and the cold isostatic pressing pressure is 100MPA-230 MPA.
Furthermore, the simple low-cost implementation method of the cold isostatic pressing mold comprises the steps that the opening of the elastic charging sealing bag is sleeved on the outer wall of the main mold, the opening of the elastic charging sealing bag is fixed with the main mold through an elastic rope, a core rod is placed inside the elastic charging sealing bag, the main mold and the supporting mold are both PVC water pipe components, the diameter of a liquid through hole is 3-5mm, the elastic charging sealing bag is a latex balloon component and has the weight of 8-30g, the supporting sealing gasket is a silica gel component, the diameter of the supporting sealing gasket is 1-2mm larger than the inner diameter of the main mold, and the thickness of the supporting sealing gasket is 20-40 mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention does not need to customize a rubber sleeve die, the price of the die material used for manufacturing the invention is very low, the purchase cycle of the material used for manufacturing the die is very short, and the material can be reused;
2. the green body after being pressed is complete and has uniform density, and the defects of water inflow, foot falling and the like are avoided;
3. the die structure can greatly reduce the die manufacturing cost, shorten the production delivery period of the die, greatly improve the production efficiency and reduce the production cost on the premise of ensuring the quality of a pressed blank;
4. according to the invention, water can be selected as a pressure transmission medium in the cold isostatic pressing process, so that the service life of the elastic charging sealing bag made of the latex balloon material can be prolonged, and the cost of pressure transmission liquid can be reduced;
5. the invention can install the core rod during charging, thereby pressing hollow products.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention prior to cold isostatic pressing;
FIG. 3 is a schematic structural diagram of embodiment 4 of the present invention;
in the figure: 1. performing primary molding; 2. supporting the mold; 3. powder material; 4. elastic sealing bags for charging; 5. an elastic cord; 6. a liquid through hole; 7. an air exhaust pipe; 8. a support gasket; 9. and (4) a core rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, the present invention provides the following technical solutions: the utility model provides a simple and easy low-cost cold isostatic mould, includes master mode 1, and the inside bottom of master mode 1 is equipped with the sealed pad 8 of support, and the top of the sealed pad 8 of support is connected with supports mould 2, is equipped with a plurality of through liquid hole 6 on the lateral wall of support mould 2, and one side of master mode 1 bottom is connected with exhaust tube 7 with inside intercommunication, supports the inside of mould 2 and is equipped with the elasticity sealing bag 4 of feeding, and the powder 3 is equipped with to the inside of the elasticity sealing bag 4 of feeding.
Furthermore, the opening of the elastic sealing bag 4 for charging is sleeved on the outer wall of the main die 1, the opening of the elastic sealing bag 4 for charging is fixed with the main die 1 through an elastic rope 5, the elastic rope 5 can be a rubber band, and the elastic sealing bag 4 for charging is fixed most simply and efficiently.
By adopting the technical scheme, the opening of the elastic charging sealing bag 4 is fixed on the main die 1 through the elastic rope 5, so that the sliding is prevented, and a sealing structure is formed among the main die 1, the supporting die 2 and the supporting sealing gasket 8.
Further, the main mold 1 and the support mold 2 are both PVC water pipe members.
Through adopting above-mentioned technical scheme, can select for use suitable PVC water pipe according to the specification size of required product.
Further, the diameter of the liquid passing hole 6 is 3 mm.
By adopting the technical scheme, the cold isobaric liquid can transmit pressure to the elastic charging sealing bag 4 through the small holes.
Further, the elastic charging seal bag 4 is a latex balloon member and has a weight of 8 g.
By adopting the technical scheme, the specification of the latex balloon can be selected according to the size of the inner wall of the supporting die 2, and the cost performance of the latex balloon is optimal between 8g and 30g through actual tests.
Further, the supporting gasket 8 is a silicone member, a diameter of the supporting gasket 8 is 1mm larger than an inner diameter of the main mold 1, and a thickness of the supporting gasket 8 is 20 mm.
By adopting the technical scheme, the supporting sealing gasket 8 can play a good sealing role after being plugged into the main die 1.
Example 2
The present embodiment is different from embodiment 1 in that: further, the diameter of the liquid passing hole 6 is 4 mm.
Further, the elastic charging seal pouch 4 was a latex balloon member and weighed 20 g.
Further, the supporting gasket 8 is a silicone member, a diameter of the supporting gasket 8 is 1.5mm larger than an inner diameter of the main mold 1, and a thickness of the supporting gasket 8 is 30 mm.
Example 3
The present embodiment is different from embodiment 1 in that: further, the diameter of the liquid passing hole 6 is 5 mm.
Further, the elastic charging seal bag 4 is a latex balloon member and has a weight of 30 g.
Further, the supporting gasket 8 is a silicone member, a diameter of the supporting gasket 8 is 2mm larger than an inner diameter of the main mold 1, and a thickness of the supporting gasket 8 is 40 mm.
Example 4
Referring to fig. 3, the difference between the present embodiment and embodiment 1 is: further, a mandrel 9 is placed inside the elastic sealing bag for charging 4.
By adopting the technical scheme, the core rod 9 is made of hard metal materials, has good compressive strength, and is beneficial to demoulding from a pressed compact after isostatic pressing.
Further, the simple low-cost implementation method of the cold isostatic pressing mold comprises the following steps:
sleeving a main body of a charging elastic sealing bag 4 in a support die 2, pulling an opening of the charging elastic sealing bag 4 open, sleeving the opening on the outer wall of a main die 1, and fixing the opening through an elastic rope 5;
connecting the air exhaust pipe 7 to an air extractor for air exhaust, so that negative pressure is formed among the main die 1, the support die 2 and the support sealing gasket 8, and the elastic charging sealing bag 4 is attached to the inner wall of the support die 2 under the action of atmospheric pressure;
(III), the powder 3 is filled into the elastic charging sealing bag 4, or the core rod 9 is placed while the powder 3 is filled into the elastic charging sealing bag 4;
after the powder 3 is filled, flattening the powder 3 at the upper opening, then taking down the elastic rope 5 for fixing, and sealing the elastic sealing bag 4 for filling;
taking out the main die 1, and putting the support sealing gasket 8, the support die 2, the charging elastic sealing bag 4 and the powder 3 in the charging elastic sealing bag 4 into a static press for isostatic pressing;
and (VI) after the pressing is finished, the elastic sealing bag 4 for filling is untied, and the pressed blank is taken out.
Further, the cold isostatic pressure was 100 MPA.
In conclusion, the invention does not need to customize the rubber sleeve die, the price of the die material used for manufacturing the invention is very low, the purchase cycle of the material used for manufacturing the die is very short, and the material can be reused; the green body after being pressed is complete and has uniform density, and the defects of water inflow, foot falling and the like are avoided; the die structure can greatly reduce the die manufacturing cost, shorten the production delivery period of the die, greatly improve the production efficiency and reduce the production cost on the premise of ensuring the quality of a pressed blank; according to the invention, water can be selected as a pressure transmission medium in the cold isostatic pressing process, so that the service life of the elastic charging sealing bag made of the latex balloon material can be prolonged, and the cost of pressure transmission liquid can be reduced; the invention can install the core rod during charging, thereby pressing hollow products.
The present invention is not limited to the above-described embodiments, and for example, the structures of the main mold 1 and the support mold 2 may be changed by splicing according to the regular shape of the product.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A simple low-cost cold isostatic mould, comprising a main mould (1), characterized in that: the bottom of the interior of the main die (1) is provided with a supporting sealing gasket (8), the top of the supporting sealing gasket (8) is connected with a supporting die (2), the side wall of the supporting die (2) is provided with a plurality of liquid through holes (6), one side of the bottom of the main die (1) is connected with an exhaust tube (7) communicated with the interior, the interior of the supporting die (2) is provided with a charging elastic sealing bag (4), and powder (3) is arranged in the charging elastic sealing bag (4).
2. A simple low cost cold isostatic press, as claimed in claim 1, wherein: the opening of the elastic charging sealing bag (4) is sleeved on the outer wall of the main die (1), and the opening of the elastic charging sealing bag (4) is fixed with the main die (1) through an elastic rope (5).
3. A simple low cost cold isostatic press, as claimed in claim 2, wherein: and a core rod (9) is arranged in the charging elastic sealing bag (4).
4. A simple low cost cold isostatic press according to claim 3, wherein: the main die (1) and the support die (2) are both PVC water pipe components.
5. A simple low cost cold isostatic press, according to claim 4, wherein: the diameter of the liquid through hole (6) is 3-5 mm.
6. A simple low cost cold isostatic press, according to claim 5, wherein: the elastic charging sealing bag (4) is a latex balloon component and has the weight of 8-30 g.
7. A simple low cost cold isostatic press according to claim 6, wherein: the supporting sealing gasket (8) is a silica gel component, the diameter of the supporting sealing gasket (8) is 1-2mm larger than the inner diameter of the main die (1), and the thickness of the supporting sealing gasket (8) is 20-40 mm.
8. A method for implementing a simple low-cost cold isostatic pressing mould according to any one of claims 1-7, characterised in that it comprises the following steps:
sleeving a main body of a charging elastic sealing bag (4) in a support die (2), pulling an opening of the charging elastic sealing bag (4) open, sleeving the opening on the outer wall of a main die (1), and fixing the opening through an elastic rope (5);
connecting the air exhaust pipe (7) to an air extractor for air exhaust to form negative pressure among the main die (1), the support die (2) and the support sealing gasket (8), so that the elastic charging sealing bag (4) is attached to the inner wall of the support die (2) under the action of atmospheric pressure;
(III) filling the powder (3) into the elastic charging sealing bag (4), or filling the powder (3) into the elastic charging sealing bag (4) and simultaneously putting the core rod (9);
after the powder (3) is filled, flattening the powder (3) at the upper opening, then taking down the elastic rope (5) for fixing, and sealing the elastic sealing bag (4) for filling;
taking out the main die (1), and putting the supporting sealing gasket (8), the supporting die (2), the charging elastic sealing bag (4) and the powder (3) in the charging elastic sealing bag (4) into a static press for isostatic pressing;
and (VI) after the pressing is finished, the elastic sealing bag (4) for filling is untied, and the pressed blank is taken out.
9. The method for implementing a simple low-cost cold isostatic pressing mold according to claim 8, wherein: the cold isostatic pressure is 100MPA-230 MPA.
10. The method for implementing a simple low-cost cold isostatic pressing mold according to claim 9, wherein: the opening of the elastic charging sealing bag (4) is sleeved on the outer wall of the main die (1), the opening of the elastic charging sealing bag (4) is fixed with the main die (1) through an elastic rope (5), a core rod (9) is placed inside the elastic charging sealing bag (4), the main die (1) and the supporting die (2) are both PVC water pipe components, the diameter of the liquid through hole (6) is 3-5mm, the elastic charging sealing bag (4) is a latex balloon component, the weight of the elastic charging sealing bag is 8-30g, the supporting sealing gasket (8) is a silica gel component, the diameter of the supporting sealing gasket (8) is 1-2mm larger than the inner diameter of the main die (1), and the thickness of the supporting sealing gasket (8) is 20-40 mm.
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| CN201911256808.5A CN110814337A (en) | 2019-12-10 | 2019-12-10 | Simple low-cost cold isostatic pressing die and implementation method thereof |
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| CN201911256808.5A CN110814337A (en) | 2019-12-10 | 2019-12-10 | Simple low-cost cold isostatic pressing die and implementation method thereof |
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Cited By (2)
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| CN116330460A (en) * | 2023-05-05 | 2023-06-27 | 江苏三责新材料科技有限公司 | Silicon carbide cylinder body forming device and silicon carbide cylinder body manufacturing process |
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