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Heat treatment technology of spheroidal graphite cast iron piston ring

A ductile iron and piston ring technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of production efficiency and production cost impact, environmental pollution, oil smoke coming out of the furnace, etc., to avoid fire safety accidents, avoid Environmental pollution and the effect of improving production efficiency

Inactive Publication Date: 2011-01-19
四川恒威活塞环有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Produced by this process, the quenching and cooling medium used is oil. During the production process, the temperature of the cooling medium will gradually increase, especially in high temperature weather, the temperature will be higher. When immersed in the cooling medium for cooling, sporadic fire points or sporadic open flames will inevitably be generated on the liquid surface of the cooling medium. When the temperature of the cooling medium is high, the sporadic fire points or sporadic open flames on the liquid surface will expand rapidly. When the combustion cannot be controlled, fire safety accidents will inevitably occur, and sometimes it will cause great losses; at the same time, after the product is quenched, a layer of oil cooling medium is attached to the surface, and it must be washed, sprayed, and dried before heating and tempering. This process lasts for 2 to 3 hours, consumes a lot of water, energy and labor, and the production efficiency and production cost are affected; moreover, during the high temperature tempering process of the product, the residual oil cooling medium attached to the product surface will inevitably Combustion produces a large amount of oil smoke coming out of the furnace, affecting the health of employees and the production environment, causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A heat treatment process for a nodular cast iron piston ring, comprising the following steps in sequence:

[0020] 1. The heating steps include in turn: loading the product into a cylinder → loading into a frame → entering a high-temperature furnace → heating up the high-temperature furnace to 930°C;

[0021] 2. Heat preservation step: heat preservation at 930°C for 30 minutes;

[0022] 3. The quenching step includes successively: polyglycol (PAG) aqueous solution quenching agent quenching→dropping, wherein, the use concentration of the organic aqueous solution quenching agent is 12.5%, and the use temperature of the PAG aqueous solution quenching agent is 10 ° C. The PAG aqueous solution quenching agent used is purchased from Nanchang Tongli Fine Chemical Co., Ltd., and its model is TL-468;

[0023] 4. In the tempering step, first heat up the medium-temperature furnace to 590°C, and then keep it warm for 130 minutes;

[0024] 5. Air cooling step,

[0025] Finally, t...

Embodiment 2

[0027] A heat treatment process for a nodular cast iron piston ring, comprising the following steps in sequence:

[0028] 1. The heating steps include in turn: loading the product into a cylinder → loading into a frame → entering a high-temperature furnace → heating up the high-temperature furnace to 940°C;

[0029] 2. Heat preservation step: heat preservation for 40 minutes at 940°C;

[0030] 3. The quenching step comprises in turn: Quenching with a hydroxyethyl cellulose aqueous solution quenching agent→dropping, wherein the concentration of the organic aqueous solution quenching agent is 20%, and the use temperature of the hydroxyethyl cellulose aqueous solution quenching agent is 25°C.

[0031] 4. In the tempering step, first heat up the medium temperature furnace to 580°C, and then keep it warm for 110 minutes;

[0032] 5. Air cooling step,

[0033] Finally, the product inspection is carried out, and the inspection results are as follows: the hardness of this batch of p...

Embodiment 3

[0035] A heat treatment process for a nodular cast iron piston ring, comprising the following steps in sequence:

[0036] 1. The heating steps include: loading the product into a cylinder → loading into a frame → entering a high-temperature furnace → heating up the high-temperature furnace to 945°C;

[0037] 2. Heat preservation step: heat preservation at 945°C for 50 minutes;

[0038] 3. The quenching step includes in turn: quenching with a polyethylene aqueous solution quenching agent → dripping, wherein the use concentration of the organic aqueous solution quenching agent is 16%, and the use temperature of the polyethylene aqueous solution quenching agent is 45 ° C.

[0039] 4. In the tempering step, first heat up the medium-temperature furnace to 570°C, and then keep it warm for 90 minutes;

[0040] 5. Air cooling step,

[0041] Finally, the product inspection is carried out, and the inspection results are: the hardness is 107.3-109.5HRB, the metallographic structure is ...

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Abstract

The invention discloses a heat treatment technology of a spheroidal graphite cast iron piston ring, belonging to the field of metal material heat treatment. The heat treatment technology successively comprises the steps of heating, keeping temperature, quenching, tempering and air cooling. In the step of quenching, an organic aqueous solution quenchant serves as cooling medium for quenching, the using density of the organic aqueous solution quenchant is 12.5-20%, using temperature is 10-45 DEG C, quenching temperature is 930-950 DEG C, time for quenching, heating and keeping temperature is 30-60 minutes, tempering temperature is 570-590 DEG C, and the time for tempering, heating and keeping temperature is 90-130 minutes. Because the cooling medium of the invention in the quenching process adopts the organic aqueous solution which does not burn, fire safety accidents can be avoided; because the tempering process does not generate oil smoke mist, environment pollution can be avoided, and the spheroidal graphite cast iron piston ring does not need to clean, spray and dry after quenched, thus improving product efficiency by 20-25%, and lowering production cost by 15-20%. The invention is also suitable for the heat treatment of other workpieces of spheroidal graphite cast iron material.

Description

technical field [0001] The invention relates to a heat treatment process for a nodular cast iron piston ring. Background technique [0002] At present, the quenching cooling medium used in the known heat treatment process of ductile iron piston rings is oily substances, which are mainly imported HQK oil, domestic KR218 fast bright quenching oil, ordinary diesel oil and ordinary machine oil. During the heat treatment of ductile iron piston rings, the general process flow is: heating step (including in turn: product loading → frame → high temperature furnace → preheating → high temperature furnace heating) → heat preservation step (insulation) → quenching step (oil quenching → Rinsing→spraying→drying)→tempering step (medium temperature furnace heating→insulation)→air cooling step (air cooling)→inspection. Produced by this process, the quenching cooling medium used is oil. During the production process, the temperature of the cooling medium will gradually increase, especially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D5/00C21D9/40C21D1/60
Inventor 刘安宁张永天徐胜洪盛利
Owner 四川恒威活塞环有限公司