CN105879971B

CN105879971B - Throwing head based on double-liquid metal fusion welding technology

Info

Publication number: CN105879971B
Application number: CN201610270313.8A
Authority: CN
Inventors: 荣守范; 杨鹏辉; 朱永长; 焦仁宝; 刘会
Original assignee: Jiamusi University
Current assignee: Jiamusi University
Priority date: 2016-04-22
Filing date: 2016-04-22
Publication date: 2021-01-26
Anticipated expiration: 2036-04-22
Also published as: CN105879971A

Abstract

The invention discloses a throwing head based on a double-liquid metal fusion welding technology and a preparation method thereof. The service life of the casting head obtained by the invention is more than 5 times of that of a high manganese steel casting head, and the casting head is equivalent to that of a cast-in hard alloy casting head, but the preparation cost of the obtained casting head is only half of that of the cast-in casting head, so that the energy consumption is reduced, and the casting head is low-carbon and environment-friendly. The performance of the working part of the throwing head obtained through detection is as follows: HRC65-66, ak > 3J/cm²(ii) a The performance of the assembly part is as follows: HRC34-38, ak > 70J/cm²。

Description

Throwing head based on double-liquid metal fusion welding technology

Technical Field

The invention relates to the field of a material throwing head preparation process, in particular to a material throwing head based on a double-liquid metal fusion welding technology and a preparation method thereof.

Background

The vertical impact crusher (sand making machine) is widely applied to the industries of mines, gravels, cement, metallurgy, hydroelectric engineering and the like, and the diameter of crushed materials is generally less than 50 mm. The material throwing head is a core part in the vertical impact sand making machine, has severe working condition, bears high-speed impact force of materials, and is subjected to abrasive wear, impact wear and a small amount of corrosive wear. Therefore, the service life of the throwing head directly influences the overall operation of the machine.

At present, the preparation process of the throwing head mainly comprises single material casting (as shown in figure 1) and bimetal insert casting. The material throwing head for producing the high manganese steel is the most extensive process in single-material casting, but the material throwing head is relatively small in impact force, and the characteristic of work hardening of the high manganese steel is difficult to exert. The bimetal insert casting is to embed a hard alloy block in low alloy steel (or high manganese steel), the service life of the material throwing head is prolonged to a certain extent by utilizing the high wear resistance of the hard alloy, the structure schematic diagram of the bimetal insert casting is shown in figure 2, the process is widely applied, but the interface bonding strength of the insert casting process is not high, so that the hard alloy block is not too large, and the service life of the material throwing head is influenced.

Disclosure of Invention

In order to solve the problems, the invention provides the throwing head based on the double-liquid metal fusion welding technology and the preparation method thereof, so that the problem of short service life of the throwing head is solved, and the cost is saved.

In order to achieve the purpose, the invention adopts the technical scheme that:

a throwing head based on a double-liquid metal fusion welding technology comprises a working surface and an assembly part, wherein the working surface is connected with the assembly part through a composite interface, the working surface is made of vanadium-containing hypereutectic high-chromium cast iron, and the assembly part is made of low alloy steel;

the vanadium-containing hypereutectic high-chromium cast iron comprises the following chemical components in percentage: 3.55 percent of C; 25% of Cr; 1.2 percent of Mn; 1.37 percent of Mo; 0.8 percent of Cu; 0.3 percent of B; 0.2 percent of Ti; v0.8%; the balance of iron;

the low alloy steel material comprises the following chemical components in percentage by weight: 3.3 percent of C; 0 to 0.3 percent of Cr; 0.7 percent of Mn; 0.30 percent of Mo; si 0.43%; 0.8 percent of Cu; the balance being iron.

The preparation method of the throwing head based on the double-liquid metal fusion welding technology comprises the following steps:

s1, pouring high-chromium cast iron liquid into the cavity, pouring low-alloy molten steel in a high-temperature state after the high-chromium cast iron is completely solidified, and welding the two metals together by using the heat of the low-alloy steel to form a metallurgically bonded composite interface;

and S2, placing a chilling material at the bottom of the high-chromium cast iron, changing the growth direction of crystal grains, and enabling carbide to grow along the slow cooling direction to form long-rod-shaped carbide vertical to the stress direction.

The invention has the following beneficial effects:

the service life of the obtained casting head is more than 5 times of that of a high manganese steel casting head, and the casting head is equivalent to that of a cast-in hard alloy casting head, but the preparation cost of the obtained casting head is only half of that of the cast-in casting head, so that the energy consumption is reduced, and the casting head is low-carbon and environment-friendly. The performance of the working part of the throwing head obtained through detection is as follows: HRC65-66, ak > 3J/cm²(ii) a The performance of the assembly part is as follows: HRC34-38, ak > 70J/cm²。

Drawings

Fig. 1 is a schematic structural diagram of a casting head obtained by casting a single material in the prior art.

Fig. 2 is a schematic structural diagram of a throwing head obtained by embedding a cemented carbide block in low alloy steel or high manganese steel by bimetallic insert casting in the prior art.

Fig. 3 is a schematic structural diagram of the throwing head obtained by the method for manufacturing the throwing head based on the two-liquid metal fusion welding technology in the embodiment of the invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides a throwing head based on a double-liquid metal fusion welding technology, which comprises a working surface 1 and an assembly part 3, wherein the working surface 1 is connected with the assembly part 3 through a composite interface 2, the working surface 1 is made of vanadium-containing hypereutectic high-chromium cast iron, and the assembly part 3 is made of low-alloy steel;

the low alloy steel material comprises the following chemical components in percentage by weight: 3.3 percent of C; 0 to 0.3 percent of Cr; 0.7 percent of Mn; 0.30 percent of Mo; si 0.43%; 0.8 percent of Cu; the balance being iron. The chemical compositions of the two materials are shown in Table 1.

TABLE 1 chemical composition and content of the throwing head are shown in wt%

2. The method for preparing the throwing head based on the two-fluid metal fusion welding technology according to claim 1, wherein the method comprises the following steps:

s2, placing a chilling material at the bottom of the high-chromium cast iron, changing the growth direction of crystal grains, and enabling carbide to grow along the slow cooling direction to form long-rod-shaped carbide perpendicular to the stress direction, so that the throwing head is shown in figure 3.

The specific implementation is based on a double-liquid metal fusion welding generation technology, the service life of the obtained throwing head is more than 5 times of that of a high manganese steel throwing head, and the throwing head is equivalent to that of an insert casting hard alloy throwing head, but the preparation cost of the obtained throwing head is only half of that of the insert casting throwing head, so that the energy consumption is reduced, and the low-carbon environment-friendly effect is realized. The performance of the working part of the throwing head obtained through detection is as follows: HRC65-66, ak > 3J/cm²(ii) a The performance of the assembly part is as follows: HRC34-38, ak > 70J/cm²。

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. The throwing head based on the double-liquid metal fusion welding technology comprises a working surface (1) and an assembling part (3), and is characterized in that the working surface (1) is connected with the assembling part (3) through a composite interface (2), the working surface (1) is made of vanadium-containing hypereutectic high-chromium cast iron, and the assembling part (3) is made of low-alloy steel;

the low alloy steel material comprises the following chemical components in percentage by weight: 3.3 percent of C; 0 to 0.3 percent of Cr; 0.7 percent of Mn; 0.30 percent of Mo; si 0.43%; 0.8 percent of Cu; the balance of iron;