A kind of preparation method of high hardness ductile iron hammer head

A ductile iron, high-hardness technology, applied in the field of hammer crushers, can solve the problems of fragile high-chromium cast iron hammers, low cost performance, non-wear-resistant high-manganese steel hammers, etc., to achieve an optimized process system and good comprehensive performance. , the effect of high impact toughness

Active Publication Date: 2018-01-23
NINGGUO HUAFENG WEAR RESISTANT MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hammers made of various materials have certain limitations, specifically: high manganese steel hammers are not wear-resistant, high chromium cast iron hammers are fragile, bimetallic hammers are expensive and cost-effective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of high hardness nodular cast iron tup that the present invention proposes, comprises the steps:

[0028] S1. Smelting: Put the raw material in a smelting furnace and heat it up to a molten state, quench and temper it, and get the alloy liquid out of the furnace, the temperature of which is 1480°C; the components of the alloy liquid include: carbon: 3.42%, silicon: 2.40%, Manganese: 0.20%, chromium: 0.44%, molybdenum: 0.21%, copper: 0.50%, nickel: 0.38%, phosphorus: ≤0.05%, sulfur: ≤0.03%, and the rest is iron;

[0029] S2. Pouring: the alloy liquid is poured to obtain the hammer body, and the pouring temperature is 1350°C;

[0030] S3. Heat treatment: heat up the hammer body to austenitize it, then keep it warm and quench it to obtain a high-hardness nodular cast iron hammer; wherein the austenitization temperature T A 933℃, austenitizing time t A 2.32h, austempering temperature T D is 270°C, the holding time of austempering is t D is 4...

Embodiment 2

[0032] A kind of preparation method of high hardness nodular cast iron tup that the present invention proposes, comprises the steps:

[0033] S1. Smelting: put the raw material in a smelting furnace and heat it up to a molten state, quench and temper it, and get the alloy liquid out of the furnace. Manganese: 0.30%, chromium: 0.42%, molybdenum: 0.24%, copper: 0.43%, nickel: 0.40%, phosphorus: ≤0.05%, sulfur: ≤0.03%, and the rest is iron;

[0034] S2. Pouring: the alloy liquid is poured to obtain the hammer body, and the pouring temperature is 1380°C;

[0035] S3. Heat treatment: heat up the hammer body to austenitize it, then keep it warm and quench it to obtain a high-hardness nodular cast iron hammer; wherein the austenitization temperature T A 917.5°C, austenitizing time t A 2.5h, austempering temperature T D is 240°C, the holding time of austempering is t D is 3.19h; among them, T A , T D , t Aand t D Meets the following relationship: T D ×(T A -730) = K 1 ,T A...

Embodiment 3

[0037] A kind of preparation method of high hardness nodular cast iron tup that the present invention proposes, comprises the steps:

[0038] S1. Smelting: Put the raw material in a smelting furnace and heat it up to a molten state, quench and temper it, and get out of the furnace to obtain alloy liquid, the temperature of which is 1460°C; the components of the alloy liquid include: carbon: 3.44%, silicon: 2.25%, Manganese: 0.26%, chromium: 0.428%, molybdenum: 0.23%, copper: 0.45%, nickel: 0.39%, phosphorus: ≤0.05%, sulfur: ≤0.03%, and the rest is iron;

[0039] S2. Pouring: the alloy liquid is poured to obtain the hammer body, and the pouring temperature is 1400°C;

[0040] S3. Heat treatment: heat up the hammer body to austenitize it, then keep it warm and quench it to obtain a high-hardness nodular cast iron hammer; wherein the austenitization temperature T A 920℃, austenitizing time t A 2h, austempering temperature T D is 250°C, the holding time of austempering is t D ...

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Abstract

The invention discloses a method for manufacturing a high-hardness spheroidal graphite cast iron hammer. The method includes the following steps that smelting is performed, wherein raw materials are placed in a smelting furnace, the temperature is increased till the raw materials are in the melted state, hardening and tempering are performed, the raw materials are delivered out of the smelting furnace, and molten alloy is obtained; casting is performed, wherein the molten alloy is cast into a hammer blank and the casting temperature is larger than or equal to 1350 DEG C; and thermal treatment is performed, wherein the temperature of the hammer blank is increased till the hammer blank is austenitized, the temperature is then kept, isothermal quenching is performed, and therefore the high-hardness spheroidal graphite cast iron hammer is obtained. The austenitizing temperature T ranges from 900 DEG C to 950 DEG C, the austenitizing time t ranges from 1.2 h to 2.5 h, the isothermal quenching temperature T<D> ranges from 230 DEG C to 290 DEG C, and the temperature keeping time t<D> of isothermal quenching ranges from 3 h to 5 h; T, T<D>, t and t<D> satisfy the following relation that T<D>*(T-730)=K<1> and T*t=K<2>*T<D>*t<D>; and K<1> ranges from 4.5*10<4> to 5.5*10<4> and K<2> ranges from 2 to 3. By the adoption of the method, the manufactured hammer has the high initial hardness and the proper impact toughness.

Description

technical field [0001] The invention relates to the technical field of hammer crushers, in particular to a method for preparing a high-hardness ductile iron hammer head. Background technique [0002] Hammer crushers are widely used in brick factories and coal gangue processing plants. The hammer head is the main wear part to withstand the impact and wear of materials during high-speed rotation. The hammer heads commonly used in brick factories now include high manganese steel hammer heads, high chromium cast iron hammer heads and bimetal composite hammer heads. However, hammers made of various materials have certain limitations, specifically: high manganese steel hammers are not wear-resistant, high chromium cast iron hammers are fragile, and bimetallic hammers are expensive and cost-effective. [0003] Therefore, a kind of not broken but also wear-resistant tup that is suitable for using in brick factory and coal gangue processing plant now is the problem urgently in need ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C37/10C22C37/08C21D1/20C21D5/00
CPCC21D1/20C21D5/00C22C37/04C22C37/08C22C37/10
Inventor 陈全心
Owner NINGGUO HUAFENG WEAR RESISTANT MATERIAL
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