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Water-air alternate quenching heat treatment process for cast grinding ball production

A technology of casting grinding balls and air alternation, which is applied in heat treatment furnaces, heat treatment equipment, quenching agents, etc., can solve problems such as improper operation, easy to cause fire, complicated equipment, and unfavorable environment, so as to achieve good promotion and application value and avoid water quenching cracking , The effect of process safety

Inactive Publication Date: 2020-12-04
NINGGUO HUAFENG WEAR RESISTANT MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High chromium cast iron grinding balls are mainly quenched with oil medium. On the one hand, oil vapor and oil residue will be generated during the oil quenching process, causing environmental pollution; on the other hand, a layer of oil will adhere to the surface of the workpiece after quenching, which will Continuous combustion produces fume, so the heat treatment production line must be equipped with a fume purification device
In addition, there is a potential danger of fire in the oil pool, and improper operation can easily cause a fire
Oil quenching or salt bath isothermal quenching can be used for heat treatment of austeric ductile iron grinding balls, but the salt bath isothermal quenching equipment is relatively complicated, and the salt vapor emitted by sodium nitrate and potassium nitrate at high temperature is strongly corrosive, which will It has adverse effects on the environment, and the quenched workpiece needs to be washed with water, so water treatment equipment is also required
The equipment purchase cost and production cost are high, which is not competitive for the production of low value-added cast iron grinding balls

Method used

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  • Water-air alternate quenching heat treatment process for cast grinding ball production
  • Water-air alternate quenching heat treatment process for cast grinding ball production
  • Water-air alternate quenching heat treatment process for cast grinding ball production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of cast iron grinding ball, its element composition is as follows by weight percentage (by weight percentage, %):

[0022] element C Si mn Cr P S Fe CADI-120 3.64 2.42 2.23 0.34 0.025 0.018 margin

[0023] Heat treatment process: heat preservation at 900°C for 4 hours for austenitization, then use water-air alternate quenching heat treatment, water temperature is 26-29°C, primary quenching: quenching for 30s, outlet water temperature 420°C, secondary quenching: quenching for 20s, exiting water The temperature is 270°C, three times of quenching: quenching for 20s, the outlet water temperature is 190°C, and then isothermally treated at 220°C for 3h.

[0024] Characterize the metallographic structure of the cast iron grinding ball of embodiment 1, as figure 1 and figure 2 It can be seen from the figure that the surface and core of the ball are composed of acicular ferrite + retained austenite + carbide + spherical graphite, wh...

Embodiment 2

[0030] A kind of cast iron grinding ball, its element composition is as follows by weight percentage (by weight percentage, %):

[0031] element C Si mn Cr P S Fe CADI-100 3.54 2.52 2.23 0.38 0.025 0.018 margin

[0032] Heat treatment process: heat preservation at 890°C for 4 hours for austenitization, then adopt water-air alternate quenching heat treatment, water temperature is 26-29°C, primary quenching: quenching for 30s, water outlet temperature 380°C, secondary quenching: quenching for 10s, water outlet The temperature is 270°C, three times of quenching: quenching for 10s, the outlet water temperature is 220°C, and then isothermally treated at 220°C for 3h.

[0033] The mechanical performance of the cast iron grinding ball of embodiment 2 is detected, and the results are as follows:

[0034]

[0035] The MLD-10 of the cast iron grinding balls in Example 2 was used for comparative wear analysis, and the oil-quenched CADI-120 was use...

Embodiment 3

[0038] A kind of cast iron grinding ball, its element composition is as follows by weight percentage (by weight percentage, %):

[0039] element C Si mn Cr P S Fe CADI-150 3.54 2.45 2.06 0.34 0.025 0.018 margin

[0040] Heat treatment process: heat preservation at 900°C for 5 hours for austenitization, then adopt water-air alternate quenching heat treatment, water temperature is 26-29°C, primary quenching: quenching for 40s, water outlet temperature 480°C, secondary quenching: quenching for 20s, water outlet The temperature is 370°C, the third quenching: quenching for 20s, the outlet water temperature is 260°C, the fourth quenching: quenching for 15s, the outlet water temperature is 220°C, and then isothermally treated at 230°C for 4h.

[0041] The mechanical performance of the cast iron grinding ball of embodiment 3 is detected, and the results are as follows:

[0042]

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Abstract

The invention discloses a water-air alternate quenching heat treatment process for cast grinding ball production, and relates to the technical field of cast grinding ball heat treatment. Water-air alternate circulating quenching heat treatment is adopted, the water-air alternate circulating frequency is n, and n is greater than or equal to 2 and smaller than or equal to 5; the water outlet temperature of the first water cooling of a cast grinding ball in the water-air alternate circulating quenching heat treatment is T1, and T1 is greater than or equal to 350 DEG C and smaller than or equal to500 DEG C; the water outlet temperature of the nth water cooling is Tn, and Tn is greater than or equal to 150 DEG C and smaller than or equal to 250 DEG C; T1>... >T(n-1)>Tn; and air cooling is conducted after each water cooling, and the total air cooling time t<total> is smaller than or equal to 360 s. According to the water-air alternate quenching heat treatment process, water and air are usedas quenching cooling media, the cast grinding ball is subjected to heat treatment in a water-air alternate quenching cooling mode, the temperature and time of each water cooling and air cooling are strictly limited, and the cast grinding ball obtains an ideal cooling curve, thereby obtaining ideal structure and product performance. According to the method, the grinding ball is effectively prevented from cracking due to water quenching. The process is safe, environment-friendly and low in cost, and has good popularization and application value.

Description

technical field [0001] The invention relates to the technical field of heat treatment of cast grinding balls, in particular to a water-air alternate quenching heat treatment process for the production of cast grinding balls. Background technique [0002] At present, the casting grinding balls that need to be quenched in China are mainly divided into two categories, one is high chromium white cast iron grinding balls, and the other is austeric nodular iron grinding balls. High chromium cast iron grinding balls are mainly quenched with oil medium. On the one hand, oil vapor and oil residue will be generated during the oil quenching process, causing environmental pollution; on the other hand, a layer of oil will adhere to the surface of the workpiece after quenching, which will Continuous combustion produces fume, so the heat treatment production line must be equipped with a fume purification device. In addition, there is a potential danger of fire in the oil pool, and imprope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/36C21D1/18C21D1/60C21D1/613
CPCC21D1/18C21D1/60C21D1/613C21D9/36
Inventor 陈全心姚永茂陈灿光周峰桂劲松程琦
Owner NINGGUO HUAFENG WEAR RESISTANT MATERIAL
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