CN101805882A - Process for controlling deformation of gas nitrocarburizing part - Google Patents
Process for controlling deformation of gas nitrocarburizing part Download PDFInfo
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- CN101805882A CN101805882A CN 201010153681 CN201010153681A CN101805882A CN 101805882 A CN101805882 A CN 101805882A CN 201010153681 CN201010153681 CN 201010153681 CN 201010153681 A CN201010153681 A CN 201010153681A CN 101805882 A CN101805882 A CN 101805882A
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Abstract
The invention discloses a process for controlling the deformation of a gas nitrocarburizing part, which comprises the following steps: performing rough-machining on the part; performing high-temperature tempering processing on the part; pre-oxidizing the part; preheating the part; performing nitrocarburizing processing on the part; pre-cooling the part; and quenching the part. The process for controlling the deformation of the gas nitrocarburizing part has the advantages of capacity of effectively controlling the deformation of a bell mouth of the part with non-uniform wall thickness, simple and convenient operation steps and relatively lower cost.
Description
Technical field
The present invention relates to the thermo-chemical treatment technical field of steel, and be particularly related to the technology of the pilot-gas carbonitriding part deformation that is applicable to the very inhomogeneous part of wall thin and thick.
Background technology
Gas nitrocarburizing is a kind of chemical heat treatment method that improves piece surface hardness, can obviously improve hardness, intensity and the wear resistance of piece surface by gas nitrocarburizing, keep piece surface fragility little simultaneously, therefore in iron and steel thermal treatment, use very extensive.
If but during part to be a kind of wall thin and thick very uneven part, because the influence of compound tissue, the influence of thermal stresses and mechanical workout stress influence can make part the distortion of bell mouth shape occur in the thin part of gas nitrocarburizing rear wall, the deformation rate of some part even reach more than 90% has a strong impact on the quality of part.
The principal element of the even part gas nitrocarburizing distortion of wall uneven distribution is compound tissue influence, thermal stresses influence and mechanical workout stress influence, especially thermal stresses influence and mechanical workout stress influence.
This is because part all will pass through mechanical roughing at gas nitrocarburizing as last, just has remaining internal stress after mechanical roughing in the part, gas altogether in the infiltrate journey these remaining internal stresss part is produced be out of shape.
In addition during the part gas nitrocarburizing charging temperature of part generally than higher, go into behind the stove part thin-walled portion temperature raise faster than the wall thickness part, volumetric expansion is also very fast, makes part produce distortion thereby form thermal stresses.
Moreover along with the thin-walled portion temperature rises rapidly, when thermal stresses obviously increases; the plasticity of thin-walled portion also can significantly improve; will produce the viscous deformation that external diameter swells when thermal stresses surpasses the yield strength of metal, thereby causes that part is thin, the thick end external diameter amount of swelling differs bigger; And in process of cooling, because thin, thick speed of cooling difference also can cause part to produce distortion.
Summary of the invention
The present invention is intended to solve in the steel thermo-chemical treatment process of prior art, because of the gas nitrocarburizing art breading causes part deformation, has a strong impact on technical problems such as part quality.
In view of this, the invention provides a kind of technology of pilot-gas carbonitriding part deformation, it is characterized in that, may further comprise the steps: part is carried out roughing; High tempering is handled; Pre-oxidation treatment; Thermal pretreatment; Carbonitriding is handled; Precooling treatment; Quench treatment.
Further, the temperature of described high tempering processing is 550 ℃～600 ℃.
Further, described pre-oxidation treatment specifically comprises: part is put into carbonitriding furnace, is that medium is heated to 500 ℃ and carries out pre-oxidation treatment with the air.
Further, described thermal pretreatment is increased to the temperature that carbonitriding is handled with the temperature of part.
Further, described precooling treatment only feeds nitrogen and carries out precooling.
Further, described quench treatment adopts oil cooling or air cooling to handle.
Further, after high tempering is handled, part and anchor clamps are cleaned up and dry with clean-out system.
In sum, the technology of pilot-gas carbonitriding part deformation provided by the invention can obviously be controlled the bell mouth shape distortion of the very inhomogeneous part of wall thin and thick, and simple operating steps, effectively reduces cost.
Description of drawings
Figure 1 shows that the process flow sheet of the pilot-gas carbonitriding part deformation that one embodiment of the invention provides;
Figure 2 shows that variable cross-section telescopic sectional view;
Figure 3 shows that another variable cross-section telescopic sectional view.
Embodiment
For technical characterictic of the present invention is become apparent, below in conjunction with accompanying drawing, provide specific embodiment, the present invention will be further described.
See also Fig. 1, it is depicted as the process flow sheet of the pilot-gas carbonitriding part deformation that one embodiment of the invention provides.
The technology of this pilot-gas carbonitriding part deformation may further comprise the steps:
Step S10 at first carries out roughing to the very uneven part of wall thin and thick.
Step S20, high tempering is handled.
After the roughing, before the correct grinding, part to be carried out 550 ℃～600 ℃ high temperings handle, the heat tracing time decides on part dimension, guarantees that part fully heats.
Compare the present invention with traditional gas nitrocarburizing technology and increased the high tempering treatment step, this is because part all will pass through mechanical roughing at gas nitrocarburizing as last, after mechanical roughing, just have remaining internal stress in the part, gas altogether in the infiltrate journey these remaining internal stresss can loosely make part produce distortion, existing is exactly distortion in order to eliminate mechanical workout stress, to slow down part with its purpose of part high tempering.
Part behind the high tempering and anchor clamps clean up and dry with clean-out system, greasy dirt, rust staining and dirt must not be arranged. the effect that part and anchor clamps are cleaned up with clean-out system has two, one is the effect of clean surface, another is that favourable surface forms the reduction process that oxide film is accelerated carburizing, nitrogen, helps the homogeneity of carbonitriding and the time of shortening gas nitrocarburizing.
Step S30, pre-oxidation treatment.
Part and anchor clamps after cleaning up are put into carbonitriding furnace, and furnace temperature descends in the time of will avoiding part to advance stove in this process influences process period and safety too much.Be that medium is heated to part about 500 ℃ and is incubated for some time and carries out pre-oxidation treatment then with the air, the soaking time of preoxidation is decided on part dimension and depth of penetration. and the purpose of pre-oxidation treatment is the thermal stresses of slowing down part, make piece surface form the layer of even oxide film, help controlling the homogeneity of thermo-chemical treatment layer depth.But prevent peroxidation, the color of workpiece surface is good with sapphirine after the preheating, and the part of stainless steel-like is good with the straw yellow then.
Step S40, thermal pretreatment.
After the part pre-oxidation treatment, the carbonitriding temperature that furnace temperature is increased to 570 ℃ is to part thermal pretreatment (not needing to feed any gas in this process).The main effect of preheating is further to reduce the thermal stresses that forms in the heat-processed, and thermal pretreatment has dual function to reducing part deformation and obtaining the uniform outward appearance of color and luster.
Step S50, carbonitriding is handled.
After part and the anchor clamps thermal pretreatment, feed NH3, CO2 gas in the gas nitrocarburizing stove, gas nitrocarburizing technology is carried out the carbonitriding processing to part routinely.
Step S60, precooling treatment.
The precooling treatment that should in stove, carry out slow cooling behind the part gas nitrocarburizing, before coming out of the stove, during stop in stove for NH3, CO2, and feed N2.The purpose of precooling treatment is to reduce the internal stress that produces in the process of cooling, improves thin, the thick speed of cooling difference of wall and the distortion of generation.
Step S70, quench treatment.
Carry out the quench treatment of oil cooling or air cooling by the part of technical requirements after to precooling treatment.
The technology of the pilot-gas carbonitriding part deformation that the embodiment of the invention provides can have been controlled the bell mouth shape distortion of part effectively, has also obtained satisfied surface hardness and case depth simultaneously.Piece surface hardness generally can be between 4005～50HV1, and case depth can reach more than the 0.12mm, and the distortion qualification rate reaches more than 99%.And simple operating steps, cost are low, and the bell mouth shape that can obviously control part is out of shape this defective.
For clear more explaination the present invention, below give an actual example to do explanation.
See also Fig. 2, the sleeve of variable cross-section shown in it, material is 40CrNiMo, and the wall thin and thick is very inhomogeneous, the thickness 1.5mm of thin-walled place, the original gas nitrocarburizing technology of the thickness 10mm. of heavy wall place is: 570 ℃ of gas nitrocarburizings, soaking time 1.2 hours, oil cooling. finding during size on inspection behind the carbonitriding has 90% part deformation overproof, and the thin end external diameter amount of swelling is+0.038～+ 0.085, the thick end external diameter amount of swelling is+0.028～+ 0.045, and deformed shape is bell mouth shape.After the method for utilizing the embodiment of the invention to provide is handled, one co-processing 200 parts, wherein the external diameter amount of swelling of 128 parts only is+0.005～+ 0.030, and also all in the dimensional tolerance range that product design document requires, promptly Deformation control rate 100% is qualified for the external diameter amount of swelling of remaining parts; Piece surface hardness is between 4005～50HV1 simultaneously, and case depth reaches more than the 0.12mm, and the surface hardness of part and case depth meet processing requirement fully.This sleeve of evidence has been controlled distortion after by technological operation of the present invention effectively.
See also Fig. 2, another variable cross-section sleeve shown in it, material is 40CrNiMo, and the wall thin and thick is very inhomogeneous, the thickness 2mm of thin-walled place, the original gas nitrocarburizing technology of the thickness 15mm. of heavy wall place is: 570 ℃ of gas nitrocarburizings, soaking time 1.2 hours, oil cooling. finding during size on inspection behind the carbonitriding has 80% part deformation overproof, and the thin end external diameter amount of swelling is+0.045～+ 0.055, the thick end external diameter amount of swelling is+0.020～+ 0.025, and deformed shape is bell mouth shape.The method of utilizing the embodiment of the invention to provide is handled, one co-processing 300 parts, wherein the external diameter amount of swelling of 258 parts is+0.005～+ 0.025, and also all in the dimensional tolerance range that product design document requires, promptly Deformation control rate 100% is qualified for the external diameter amount of swelling of remaining parts; The surface hardness and the case depth of part also meet processing requirement fully simultaneously. and this sleeve of evidence is zero by technological operation after strain overproof rate of the present invention.
In sum, the technology of the pilot-gas carbonitriding part deformation that the embodiment of the invention provides can obviously be controlled the bell mouth shape distortion of the very inhomogeneous part of wall thin and thick, and simple operating steps, effectively reduces cost.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (7)
1. the technology of a pilot-gas carbonitriding part deformation is characterized in that, may further comprise the steps:
Part is carried out roughing;
High tempering is handled;
Pre-oxidation treatment;
Thermal pretreatment;
Carbonitriding is handled;
Precooling treatment;
Quench treatment.
2. the technology of pilot-gas carbonitriding part deformation according to claim 1 is characterized in that, the temperature that described high tempering is handled is 550 ℃～600 ℃.
3. the technology of pilot-gas carbonitriding part deformation according to claim 1 is characterized in that, described pre-oxidation treatment specifically comprises: part is put into carbonitriding furnace, is that medium is heated to 500 ℃ and carries out pre-oxidation treatment with the air.
4. the technology of pilot-gas carbonitriding part deformation according to claim 1 is characterized in that, described thermal pretreatment is increased to the temperature that carbonitriding is handled with the temperature of part.
5. the technology of pilot-gas carbonitriding part deformation according to claim 1 is characterized in that, described precooling treatment only feeds nitrogen and carries out precooling.
6. the technology of pilot-gas carbonitriding part deformation according to claim 1 is characterized in that, described quench treatment adopts oil cooling or air cooling to handle.
7. the technology of pilot-gas carbonitriding part deformation according to claim 1 is characterized in that, after high tempering is handled, part and anchor clamps is cleaned up and dries with clean-out system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010153681 CN101805882A (en) | 2010-04-22 | 2010-04-22 | Process for controlling deformation of gas nitrocarburizing part |
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| CN 201010153681 CN101805882A (en) | 2010-04-22 | 2010-04-22 | Process for controlling deformation of gas nitrocarburizing part |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121085A (en) * | 2011-01-20 | 2011-07-13 | 西北工业大学 | Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces |
| CN103834911A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | New workpiece surface low-temperature carbonitriding method |
| CN108677134A (en) * | 2018-06-13 | 2018-10-19 | 王华银 | A kind of carbo-nitriding method of waist wheel |
| CN110819936A (en) * | 2019-10-23 | 2020-02-21 | 广州市机电工业研究所 | Corrosion-resistant soft nitriding process method in ammonia-nitrogen-carbon dioxide atmosphere |
| CN115572937A (en) * | 2022-10-28 | 2023-01-06 | 西安理工大学 | High-hardness antifriction steel wire ring and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654700A (en) * | 2005-02-24 | 2005-08-17 | 哈尔滨工业大学 | Rare earth and carbon co-infiltration method in continuous furnace for automobile gearbox gear |
| CN1804128A (en) * | 2005-11-30 | 2006-07-19 | 重庆长江轴承工业有限公司 | High carbon chromium bearing parts surface chemical heat-treatment process |
| CN101368275A (en) * | 2007-08-15 | 2009-02-18 | 沈阳鼓风机(集团)有限公司 | 42CrMoE thermal treatment technique |
-
2010
- 2010-04-22 CN CN 201010153681 patent/CN101805882A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654700A (en) * | 2005-02-24 | 2005-08-17 | 哈尔滨工业大学 | Rare earth and carbon co-infiltration method in continuous furnace for automobile gearbox gear |
| CN1804128A (en) * | 2005-11-30 | 2006-07-19 | 重庆长江轴承工业有限公司 | High carbon chromium bearing parts surface chemical heat-treatment process |
| CN101368275A (en) * | 2007-08-15 | 2009-02-18 | 沈阳鼓风机(集团)有限公司 | 42CrMoE thermal treatment technique |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121085A (en) * | 2011-01-20 | 2011-07-13 | 西北工业大学 | Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces |
| CN102121085B (en) * | 2011-01-20 | 2012-08-29 | 西北工业大学 | Method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces |
| CN103834911A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | New workpiece surface low-temperature carbonitriding method |
| CN108677134A (en) * | 2018-06-13 | 2018-10-19 | 王华银 | A kind of carbo-nitriding method of waist wheel |
| CN110819936A (en) * | 2019-10-23 | 2020-02-21 | 广州市机电工业研究所 | Corrosion-resistant soft nitriding process method in ammonia-nitrogen-carbon dioxide atmosphere |
| CN110819936B (en) * | 2019-10-23 | 2022-04-15 | 广州市广智机电工业研究所有限公司 | Corrosion-resistant soft nitriding process method in ammonia-nitrogen-carbon dioxide atmosphere |
| CN115572937A (en) * | 2022-10-28 | 2023-01-06 | 西安理工大学 | High-hardness antifriction steel wire ring and preparation method thereof |
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Application publication date: 20100818 |