Bimetal new material forming process

Abstract

The invention discloses a bimetal new material forming process, and relates to the technical field of metal forming, and the bimetal new material forming process comprises the following steps: S1, atomizing molten metal to prepare powder; s2, powder collection and classification; s3, manufacturing an ingot mold and filling powder; and S4, high-temperature hot isostatic pressing. According to the novel bimetallic material forming process, steel needing to participate in a working part is molten into a liquid state and atomized and sprayed out to form metal powder, a base body part is formed by forging cheap metal through a traditional process, and the metal powder is sieved and classified, so that the metal powder is obtained. The powder and the formed base body are placed in an ingot mold and then sequentially subjected to cold isostatic pressing and hot isostatic pressing so that the powder can be formed into an ingot or a material, the internal structure of the ingot mold can be matched with the structure of a finished product when the ingot mold is designed, the structure of the finished product can be consistent with the structure of a needed product, follow-up forging and rolling are not needed, and the production efficiency is improved. The production cost and the production process are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal forming, and specifically to a new process for forming a bimetallic material. Background Art

[0002] The preparation of bimetallic materials generally adopts a process route of steel melt atomization to powder, filling an ingot mold, cold isostatic pressing, and hot isostatic pressing at high temperature. Bimetallic materials usually involve the combination of two metal powders with different compositions or properties.

[0003] The existing preparation of bimetallic materials requires obtaining an ingot after hot pressing, and then the ingot needs to be forged and rolled to form a finished product, and it is impossible to directly form a finished product in the hot pressing process.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and a new process for forming a bimetallic material is proposed. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a new process for forming a bimetallic material, which solves the problems raised in the above background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A new process for forming a bimetallic material, the new process for forming a bimetallic material includes the following steps:

[0007] S1. Atomization of metal steel melt to powder:

[0008] Since a part of the metal in the matrix does not participate in the work, this part of the metal steel is forged and formed by a relatively inexpensive metal using a traditional process. Another metal steel is melted and converted into a liquid state, and the liquid steel is sprayed out through an atomization nozzle to form small and uniform steel droplets. These steel droplets are rapidly cooled and solidified into small and round powders during the flight in the air.

[0009] S2. Powder collection and classification:

[0010] Collect the metal powder and screen it, and then classify it according to the particle size and shape of the powder.

[0011] S3. Making an ingot mold and filling the powder:

[0012] Design and manufacture an ingot mold according to the required ingot shape and size, place the matrix forged and formed by the traditional process in the preset position of the ingot mold, and then fill the classified metal steel powder into the ingot mold, and ensure that the powder is evenly filled and fills the ingot mold.

[0013] S4. Hot isostatic pressing at high temperature:

[0014] The ingot mold is placed in a hot isostatic press and pressure is applied to the ingot mold at high temperature, so that the powder is further compressed and sintered. During the hot isostatic pressing process, impurities and pores in the powder are removed.

[0015] Furthermore, in step S1, the two types of steel are high carbon steel and low carbon steel, respectively, and the particle size of the steel powder sprayed by the atomizing nozzle is between 10-100 μm.

[0016] Furthermore, in step S2, the remaining metal powder after sieving is put into a grinder for grinding, and the ground powder is sieved again and classified.

[0017] Furthermore, in step S3, when the powder is filled into the ingot mold, a vibration force is applied to the ingot mold by a vibration motor so that the metal powder is fully filled into the ingot mold.

[0018] Furthermore, in step S3, the shape of the ingot mold is directly adapted to the shape of the finished product.

[0019] Furthermore, in step S4, the high temperature is controlled at 1000-1200 degrees Celsius and the pressure is between 100-6000 MPa.

[0020] Furthermore, in step S4, the ingot mold is rotated in all directions by a motor when receiving pressure, so as to redistribute the pressure and reduce the pressure gradient, that is, the rate at which the pressure changes in the ingot mold.

[0021] Furthermore, in step S4, after hot isostatic pressing is completed, the ingot mold and the internal embryonic body are cooled slowly and uniformly, so that they slowly solidify and form a dense ingot or finished product. Since the shape of the ingot mold is directly adapted to the shape of the finished product, the shape of the finished product is consistent with the desired shape of the finished product.

[0022] The present invention provides a new bimetallic material forming process, which has the following beneficial effects:

[0023] 1. The bimetallic new material forming process is to melt the steel that needs to participate in the working part into a liquid state and spray it out into atomization to form metal powder, while the matrix part is forged by traditional technology using cheap metal. The metal powder is screened and classified, and the powder and the formed matrix are placed in an ingot mold and then cold isostatically pressed and hot isostatically pressed in sequence to make the powder into ingots or finished materials. When designing the ingot mold, its internal structure is adapted to the structure of the finished product, so that the structure of the finished material is consistent with the required product structure, thereby eliminating the need for subsequent forging and rolling, thereby reducing production costs and production processes, and improving production efficiency.

[0024] 2. The process for forming the new bimetallic material: When the powder is filled into the ingot mold, a vibration motor is used to vibrate the ingot mold to fully fill the powder, prevent the generation of voids, ensure the powder is tightly filled, and the powder remaining after sieving is recycled, ground, and sieved again to increase the raw materials that can participate in classified static pressing. Brief Description of the Drawings

[0025] Figure 1 It is a schematic flow chart of a process for forming a new bimetallic material of the present invention;

[0026] Figure 2 It is a schematic diagram of the product after hot isostatic pressing of the process for forming a new bimetallic material of the present invention using ingot molds with different structures.

[0027] As shown in the drawings: 1. Powder layer; 2. Substrate; Detailed Embodiment

[0028] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0029] As Figure 1 shown, the present invention provides a technical solution: A process for forming a new bimetallic material, the process for forming the new bimetallic material includes the following steps:

[0030] S1. Atomization of molten metal steel into powder:

[0031] Since a part of the metal in the matrix does not participate in the work, this part of the metal steel is forged into shape by a relatively inexpensive metal using a traditional process. Another metal steel is melted and converted into a liquid state, and the liquid steel is sprayed out through an atomization nozzle to form small and uniform steel droplets. These steel droplets are rapidly cooled and solidified into small and round powders during the flight in the air;

[0032] Among them, the two kinds of steel are high-carbon steel and low-carbon steel respectively, and the particle size of the steel powder sprayed out through the atomization nozzle is between 10 - 100 μm;

[0033] S2. Powder collection and classification:

[0034] Collect the metal powder and sieve it, and then classify it according to the particle size and shape of the powder;

[0035] Among them, the metal powder remaining after sieving is put into a grinding machine for grinding, and the ground powder is sieved again and classified;

[0036] S3. Making the ingot mold and loading the powder:

[0037] The ingot mold is designed and manufactured according to the required ingot shape and size. The matrix formed by forging with traditional processes is placed in the preset position of the ingot mold. Subsequently, the classified metal steel powder is filled into the ingot mold, and it is ensured that the powder is evenly filled and fills the ingot mold completely.

[0038] Among them, when filling the powder into the inside of the ingot mold, a vibration acting force is applied to the ingot mold through a vibration motor, so that the metal powder is fully filled into the inside of the ingot mold, and the shape of the ingot mold directly matches the shape of the finished product.

[0039] S4. Hot isostatic pressing at high temperature:

[0040] The ingot mold is placed in a hot isostatic press, and pressure is applied to the ingot mold at high temperature, so that the powder is further compressed and sintered. During the hot isostatic pressing process, impurities and pores in the powder will be removed.

[0041] Among them, the high temperature is controlled between 1000 - 1200 degrees Celsius, and the pressure is between 100 - 6000 MPa. When the ingot mold is receiving pressure, a motor is used to rotate it in all directions to redistribute the pressure and reduce the pressure gradient. The pressure gradient is the rate at which the pressure changes in the ingot mold. After the hot isostatic pressing is completed, the ingot mold and the embryo inside it are cooled slowly and evenly, so that it slowly solidifies and forms a dense ingot or finished product. And because the shape of the ingot mold directly matches the shape of the finished product, the shape after forming is consistent with the required finished product shape.

[0042] Based on the above description, in the present invention, the steel for the part that needs to participate in the work is melted into a liquid state and atomized and sprayed to form metal powder, while the matrix part is forged and formed with traditional processes using inexpensive metal. After sieving and classifying the metal powder, both the powder and the formed matrix are placed in the ingot mold and then cold isostatic pressing and hot isostatic pressing are carried out in sequence to make the powder form an ingot or a finished product. When designing the ingot mold, its internal structure is made to match the structure of the product after forming, so that the structure after forming is consistent with the required product structure, thus eliminating the need for subsequent forging and rolling, reducing production costs and production processes, and improving production efficiency.

[0043] Secondly, when the powder is filled into the ingot mold, a vibration motor is used to vibrate the ingot mold to fully fill the powder, preventing the generation of voids, ensuring that the powder is tightly filled. Moreover, the powder remaining after sieving is recycled, ground, and sieved again to increase the raw materials that can participate in classified static pressing.

[0044] Based on the above description, using the operation processes in the above steps S1 - S4, different-shaped products can be formed by hot isostatic pressing according to the different internal structures of the ingot mold. Specifically, as Figure 2 shown, Figure 2 in which A - D are several common shapes of the formed products. Among them, the powder layer 1 is the steel powder made by atomization, and the base material 2 is the metal steel forged and formed with traditional processes.

[0045] In summary, when the bimetallic new material forming process is used, first, the base metal does not participate in the work, and the metal steel of this part is forged by traditional technology using relatively cheap metal, and the other metal steel is melted and converted into liquid, and the liquid steel is sprayed through an atomizing nozzle to form small and uniform steel droplets, which are quickly cooled and solidified into small and round powders during the flight in the air;

[0046] Collect the metal powder and sieve it, then classify it according to the particle size and shape of the powder, put the remaining metal powder after sieving into the grinder for grinding, and sieve the ground powder again and classify it;

[0047] The ingot mold is designed and manufactured according to the required ingot shape and size, and the matrix formed by traditional forging process is placed in the preset position of the ingot mold, and then the classified metal steel powder is filled into the ingot mold, and it is ensured that the powder is filled evenly and fills the ingot mold. When the powder is filled into the ingot mold, the vibration motor is used to apply a vibration force to the ingot mold, so that the metal powder is fully filled into the ingot mold, and the shape of the ingot mold is directly adapted to the shape of the finished product;

[0048] The ingot mold is placed in a hot isostatic press and pressure is applied to the ingot mold at high temperature to further compress and sinter the powder. During the hot isostatic pressing process, impurities and pores in the powder will be removed. The high temperature is controlled at 1000-1200 degrees Celsius and the pressure is between 100-6000 MPa. When the ingot mold is under pressure, a motor is used to rotate it in all directions to redistribute the pressure and reduce the pressure gradient. The pressure gradient is the rate at which the pressure changes in the ingot mold. After the hot isostatic pressing is completed, the ingot mold and its internal embryo are cooled slowly and evenly to make it slowly solidify and form a dense ingot or finished product. Since the shape of the ingot mold is directly adapted to the shape of the finished product, the shape of the finished product is consistent with the required shape of the finished product.

[0049] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A new bimetallic material forming process, characterized in that: The bimetallic new material forming process comprises the following steps: S1. Atomization of molten steel powder: Since the base metal does not participate in the work, this part of the metal steel is forged by traditional technology using relatively cheap metal, and the other metal steel is melted and converted into liquid, and the liquid steel is sprayed through an atomizing nozzle to form small and uniform steel droplets, which are quickly cooled and solidified into small and round powders during the flight in the air; S2. Powder collection and classification: Collect metal powders, sieve them, and classify them according to particle size and shape; S3. Making ingot mold and filling powder: Design and manufacture the ingot mold according to the required ingot shape and size, place the matrix formed by traditional forging process into the preset position of the ingot mold, and then fill the classified metal steel powder into the ingot mold, and ensure that the powder is filled evenly and fills the ingot mold; S4, high temperature hot isostatic pressing: The ingot mold is placed in a hot isostatic press and pressure is applied to the ingot mold at high temperature, so that the powder is further compressed and sintered. During the hot isostatic pressing process, impurities and pores in the powder are removed.

2. A bimetallic new material forming process according to claim 1, characterized in that: In the step S1, the two types of steel are high carbon steel and low carbon steel, respectively, and the particle size of the steel powder sprayed by the atomizing nozzle is between 10-100 μm.

3. A process for forming a new bimetallic material according to claim 1, characterized in that: In the step S2, the remaining metal powder after sieving is put into a grinder for grinding, and the ground powder is sieved again and classified.

4. A process for forming a new bimetallic material according to claim 1, characterized in that: In the step S3, when the powder is filled into the ingot mold, a vibration force is applied to the ingot mold through a vibration motor so that the metal powder is fully filled into the ingot mold.

5. A process for forming a new bimetallic material according to claim 1, characterized in that: In step S3, the shape of the ingot mold is directly adapted to the shape of the finished product.

6. A bimetallic new material forming process according to claim 1, characterized in that: In step S4, the high temperature is controlled at 1000-1200 degrees Celsius and the pressure is between 100-6000 MPa.

7. A process for forming a new bimetallic material according to claim 1, characterized in that: In step S4, the ingot mold is rotated in all directions by a motor when receiving pressure to redistribute the pressure and reduce the pressure gradient, that is, the rate at which the pressure changes in the ingot mold.

8. A process for forming a new bimetallic material according to claim 1, characterized in that: In step S4, after hot isostatic pressing is completed, the ingot mold and the internal embryonic body are slowly and uniformly cooled to slowly solidify and form a dense ingot or finished product. Since the shape of the ingot mold is directly adapted to the shape of the finished product, the shape of the finished product is consistent with the desired shape of the finished product.

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