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Method for manufacturing dual-metal dual-liquid composite hammer head

A composite hammer, bimetal technology, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of affecting the interface bonding, difficult to form metallurgical bonding, hammer fracture and other problems

Active Publication Date: 2014-09-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention lies in that it is difficult to realize complete melting of the separator, which affects the metallurgical bonding of the interface between the hammer head and the hammer handle. Moreover, it is difficult to completely remove pollutants such as water vapor on the surface of the separator, which is easy to react with the molten metal and form slag at the interface, which will also Affects interfacial bonding, therefore, poor stability of the invention
[0004] CN101607304A discloses compounding high-chromium cast iron materials on both sides of the hammer handle. The method adopts a medium partition, pours high-chromium cast iron first, and pours carbon steel at a pouring temperature of 1350-1400°C after 15-35 seconds. , clear sand after solidification to make a composite hammer head, the problem of this invention is similar to that of CN102872941A, because it is difficult for the two metals to form a metallurgical bond due to the existence of the separator
[0005] CN102873308A discloses the use of lost foam vacuum casting method to prepare composite hammer head, first adopt the method of lost foam, there will remain unburned foam residues in the composite hammer head, the hammer head bears impact load during use, and the composite hammer head The residue will become the source of cracks and the hammer head will break; moreover, the invention patent does not adopt the method of interfacial metallurgical bonding
[0006] The composite hammer prepared by all the above methods cannot guarantee the metallurgical bonding of the bimetallic interface.

Method used

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  • Method for manufacturing dual-metal dual-liquid composite hammer head
  • Method for manufacturing dual-metal dual-liquid composite hammer head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The high chromium cast iron of the composite hammer head is Cr15, the composition and mass percentage are: C: 3.6%, Cr: 15%, Si: 0.6%, Mn: 0.6%, Mo: 1.0%, Al: 0.025%, P ≤0.04%, S≤0.04%, the balance is Fe.

[0027] The composition and mass percentage of low-carbon alloy steel are: C: 0.28%, Cr: 1.0%, Si: 0.8%, Mn: 0.8%, Mo: 1.0%, Al: 0.025%, P≤0.04%, S≤0.04%, The balance is Fe.

[0028] The sand for mold preparation is 70-140 mesh quartz sand with a mud content of <0.5%; the binder is water glass with an added amount of 5%; it is hardened with carbon dioxide; the surface is coated with zircon powder quick-drying paint.

[0029] According to the composition requirements of high-chromium cast iron and low-carbon alloy steel, they are respectively smelted in two intermediate frequency induction furnaces, deoxidized with aluminum wire, and high-chromium cast iron and low-carbon alloy steel are poured into two ladle respectively.

[0030] The low-carbon alloy steel is poured first. ...

Embodiment 2

[0035] The high chromium cast iron of the composite hammer is Cr20 type, the composition and mass percentage are: C: 3.2%, Cr: 20%, Si: 0.6%, Mn: 0.6%, Mo: 1.0%, Al: 0.025%, P≤0.04 %, S≤0.04%, the balance is Fe.

[0036] Low-carbon alloy steel is the same as in Example 1.

[0037] The sand for mold preparation is 70-140 mesh quartz sand with a mud content of <0.5%; the binder is water glass with an added amount of 5%; it is hardened with carbon dioxide; the surface is coated with zircon powder quick-drying paint.

[0038] According to the composition requirements of high-chromium cast iron and low-carbon alloy steel, they are respectively smelted in two intermediate frequency induction furnaces, deoxidized with aluminum wire, and high-chromium cast iron and low-carbon alloy steel are poured into two ladle respectively.

[0039] The low-carbon alloy steel is poured first. When the temperature drops to 1525°C, the high-chromium cast iron liquid is poured through the upper sprue, and the...

Embodiment 3

[0044] The high chromium cast iron of the composite hammer head is Cr25, the composition and mass percentage are: C: 3.0%, Cr: 25%, Si: 0.6%, Mn: 0.6%, Mo: 1.0%, Al: 0.025%, P ≤0.04%, S≤0.04%, the balance is Fe.

[0045] Low-carbon alloy steel is the same as in Example 1.

[0046] The sand for mold preparation is 70-140 mesh quartz sand with a mud content of <0.5%; the binder is water glass with an added amount of 5%; it is hardened with carbon dioxide; the surface is coated with zircon powder quick-drying paint.

[0047] According to the composition requirements of high-chromium cast iron and low-carbon alloy steel, they are respectively smelted in two intermediate frequency induction furnaces, deoxidized with aluminum wire, and high-chromium cast iron and low-carbon alloy steel are poured into two ladle respectively.

[0048] The low-carbon alloy steel is poured first, and when the temperature drops to 1525℃, the high chromium is poured through the upper sprue

[0049] Cast iron liqu...

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Abstract

The invention discloses a method for manufacturing a dual-metal dual-liquid composite hammer head. The method comprises the following steps: (1) hardening a composite hammer head mold by adopting quartz sand, water glass and carbon dioxide, coating the surface of the mold with quick drying paint; (2) smelting high-chromium cast iron and low-carbon alloy steel respectively, and deoxidizing by using aluminum wires; (3) pouring low-carbon alloy molten steel, making residual molten steel to flow into a liquid collecting pit, and stopping pouring of the alloy molten steel; (4) when the temperature of the low-carbon alloy molten steel in the mold falls to 1,500-1,530 DEG C, and pouring high-chromium molten iron through an upper-layer sprue at the temperature of 1,400-1,420 DEG C; (5) after pouring the high-chromium molten iron, preserving heat in an interface area for 1-5 minutes; (6) condensing and cooling a casting to obtain the composite hammer head; (7) annealing, quenching, tempering and performing air cooling. The high-chromium cast iron hardness of the composite hammer head can be over HRC62, the impact toughness alphak is greater than or equal to 7J / cm<2>, the tensile strength sigmab of a low-carbon alloy steel part is greater than or equal to 1,200MPa, and alphaku is greater than or equal to 50J / cm<2>.

Description

Technical field [0001] The invention relates to a preparation method of a hammer head suitable for impact and wear conditions in the fields of mining, building materials, metallurgy and the like. Background technique [0002] The hammer head is a key component of the hammer crusher, and the consumption is huge. The domestic annual demand is about 150,000 tons. The material of the hammer head wear area should have high hardness, high wear resistance and certain toughness, and the non-wear area should be used The process bears alternating bending stress and impact stress, and requires high strength and toughness. Therefore, the bimetal composite process is used to take into account the wear resistance of the hammer head and the strength and toughness of the non-wear area, but the bimetal composite interface achieves complete metallurgical bonding It is the key to obtain high-quality composite hammers. If the interface is not well connected, part of the high chromium cast iron of t...

Claims

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Application Information

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IPC IPC(8): B22D19/16C21D9/00C21D5/00C21D6/00C22C38/22
Inventor 郑开宏王海艳王娟宋东福王秀连徐静
Owner GUANGDONG INST OF NEW MATERIALS