CN102978349A - Bright heat treatment method for 30CrMnSiA part - Google Patents
Bright heat treatment method for 30CrMnSiA part Download PDFInfo
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- CN102978349A CN102978349A CN2012100028347A CN201210002834A CN102978349A CN 102978349 A CN102978349 A CN 102978349A CN 2012100028347 A CN2012100028347 A CN 2012100028347A CN 201210002834 A CN201210002834 A CN 201210002834A CN 102978349 A CN102978349 A CN 102978349A
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Abstract
The present invention discloses a bright heat treatment method for a 30CrMnSiA part, wherein the method comprises medium temperature salt bath quenching, washing, crucible alkaline bath furnace tempering and other steps, and the treated part has a bright appearance, shows a lightgrey color of a metal, and does not require acid washing. According to the bright heat treatment method, size and appearance of the part can be ensured, the part can directly be subjected to an electroplating treatment under a finished product state after completing the heat treatment, the strength of the part after the heat treatment can further well meet design requirements, and the part after the heat treatment does not require acid washing or deformation correction, such that assembly line balancing can be shortened, production efficiency can be increased, and energy consumption can be reduced.
Description
Technical field
The present invention relates to metallic substance heat treatment technics field, particularly relate to a kind of bright heat treatment method of 30CrMnSiA part.
Background technology
The 30CrMnSiA material is a kind of structural lowalloy steel, is the most widely used a kind of quenched and tempered steel of aerospace production, has higher intensity and toughness after quenching+high tempering thermal treatment.As design requirements tensile strength 1080MPa～1275MPa (when being converted into hardness and being 35～41HRC), normally first Finishing Parts Machining is near the finished product state postheat treatment, the high significant dimensions of this element precision of reprocessing after the thermal treatment, obtain the desired size of drawing and outward appearance, finally under finished product state, carry out electroplating processes.If heat treatment step can guarantee size and the outward appearance of part, part just can directly carry out electroplating processes after thermal treatment under the finished product state.
Often adopt at present two kinds of heat treating methods to process the 30CrMnSiA part, method one is to re-use the vacuum oven tempering after vacuum oven quenches, the accessory appearance light that the method is processed, but have following shortcoming: quenching strain is difficult to control, and distortion post-equalization difficulty is large; Quenching and tempering will be grown than air resistance furnace and salt bath furnace heat-up time.Method two is: middle thermohaline liquid furnace re-uses the nitrate furnace tempering after quenching, and the part that the method is processed is difficult for oxidation, can guarantee size and the outward appearance of part, but have following shortcoming: the piece surface greasy dirt is difficult to clean up after quenching; Accessory appearance is brightless after the tempering; By making the part light after the pickling, produce hydrogen embrittlement but easily bring out part.
Summary of the invention
Technical problem to be solved by this invention be that the thermal distortion that overcomes existing heat treating method is difficult to control, heat treatment efficiency is not high or thermal treatment after piece surface be difficult to clean, the inadequate defective of light of outward appearance, the bright heat treatment method of the 30CrMnSiA part that a kind of efficient is high, thermal distortion is little is provided.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The bright heat treatment method of 30CrMnSiA part of the present invention comprises the steps:
(1) quench: in thermohaline liquid furnace in the part immersion of drying, the heating of under 880～900 ℃, quenching, Quenching Soaking Time is pressed tz=(3～5) min+ δ D and is calculated, after insulation finishes, place 20～80 ℃ machine oil to cool off part, wherein, tz is Quenching Soaking Time, unit is min, δ is the Quenching Soaking Time coefficient, gets 0.4～0.7, and unit is min/mm, D is net thickness or the diameter of part, and unit is mm;
(2) with cooled Cleaning of Parts;
(3) tempering: tempering temperature is 480～540 ℃, NaOH crucible alkaline bath furnace is warming up to be higher than 30～40 ℃ of tempering temperatures, is cooled to tempering temperature again, before heating and in the laser heating process, according to 28～32g/m
3The ratio of h adds yellow prussiate of potash (m
3Be the alkaline bath volume), part is put into the tempering of crucible alkaline bath furnace, tempering insulation time is 15～30min, and insulation is transferred to water-cooled after finishing, and is not more than 5s transfer time, and the part that hardness is qualified after the water-cooled carries out following process.Add yellow prussiate of potash and can in time remove the scum silica frost of crucible alkaline bath furnace.
In the step of above-mentioned bright heat treatment method (1), the drying means of the part of described drying is: part is put into after the oil removing of electrochemical deoiling groove in 150～250 ℃ of oven dry.After insulation finishes, part is placed 20～80 ℃ No. 20 or No. 30 machine oil coolings are no less than 2min.
In the step of the bright heat treatment method of aforementioned 30CrMnSiA part (2), described cleaning is: at first part is put into the oil removing of electrochemical deoiling groove, then cleaned 10～20min in 80～100 ℃ hot water tank, last cold water cleans.
In the step of the bright heat treatment method of aforementioned 30CrMnSiA part (3), the additional proportion of yellow prussiate of potash is preferably 30g/m
3H.
In the aforementioned hot treatment process, when carrying out the oil removing of electrochemical deoiling groove, the prescription of electrochemical deoiling groove is sodium hydroxide 6～10%, yellow soda ash 3～6%, water glass 1～3%, and surplus is water, and content is the quality percentage composition.
Compared with prior art, the present invention with the 30CrMnSiA part through salt bath quenching, alkaline bath tempering heat treatment, accessory appearance light after the processing, present the light gray of metal, need not pickling, and heat treating method of the present invention can guarantee size and the outward appearance of part, part thermal treatment under finished product state can directly enter electroplating processes after finishing, and the intensity after the thermal treatment also can well reach design requirements, because part need not pickling or is out of shape correction after the thermal treatment, so can shorten technique same period, enhance productivity, reduce energy consumption.
Description of drawings
Fig. 1 is the support arm structure synoptic diagram of 30CrMnSiA material, and the net thickness of this part is got 5mm;
Fig. 2 is the sectional view of Fig. 1;
Fig. 3 is the bolt parts drawing that 30CrMnSiA materials processing is made, and the effective diameter of this part is got 12mm.
Embodiment
Embodiment 1: the thermal treatment of support arm illustrated in figures 1 and 2
(1) oil removing: support arm is put into 80 ℃ electrochemical deoiling groove soak and to clean with cotton yarn after 15 minutes, then with 80 ℃ of hot water cleanings, clean with cold water at last; Electrochemical deoiling groove prescription is: sodium hydroxide 8%, and yellow soda ash 4%, water glass 2%, surplus is water, content is the quality percentage composition;
(2) oven dry: with iron wire colligation support arm, the groove end is downward, then in 150 ℃ of oven dry;
(3) quench: the heating of quenching in the middle thermohaline liquid furnace with 890 ℃ of support arm immersions, soaking time is pressed tz=(3～5) min+ δ D and is calculated, the soaking time radix is got 5min, δ is the Quenching Soaking Time coefficient, gets 0.6min/mm, and D is that net thickness or the diameter of part is 5mm, tz=5+0.6 * 5=8min, after insulation finishes, part changed over to immediately in 40 ℃ No. 20 machine oil and cools off, cooling time 5min;
(4) clean: at first support arm is put into the oil removing of electrochemical deoiling groove, then cleaned 20min in 80 ℃ hot water tank, last cold water cleans;
(5) tempering: NaOH crucible alkaline bath furnace is warming up to 540 ℃ (being higher than 30 ℃ of tempering temperatures), is cooled to 510 ℃ of tempering temperatures again, (the alkaline bath volume is 0.22m in the stove to add the 6.6g yellow prussiate of potash in the crucible alkaline bath furnace
3, add-on is pressed 30g/m
3H calculates), descum is put into the tempering of crucible alkaline bath furnace with support arm, the tempering Heating temperature is 510 ℃, and tempering insulation time is 25min, and insulation finishes to be transferred to water-cooled, 3 seconds transfer time, the hardness that detects support arm after the tempering is 38HRC, and the groove port sizes is shunk, and shrinkage is in 0.10mm, meet design requirement, surface-brightening is light grey, can directly enter follow-up electroplating work procedure.
Embodiment 2: the thermal treatment of bolt shown in Figure 3
(1) oil removing: bolt is put into 90 ℃ electrochemical deoiling groove soak and to clean with cotton yarn after 20 minutes, then with 90 ℃ of hot water cleanings, clean with cold water at last; Electrochemical deoiling groove prescription is: sodium hydroxide 10%, and yellow soda ash 3%, water glass 3%, surplus is water, content is the quality percentage composition;
(2) oven dry: with iron wire colligation bolt, thread end is downward, then in 200 ℃ of oven dry;
(3) quench: the heating of quenching in the middle thermohaline liquid furnace with 900 ℃ of bolt immersions, soaking time is pressed tz=(3～5) min+ δ D and is calculated, the soaking time radix is got 3min, δ is the Quenching Soaking Time coefficient, gets 0.5min/mm, and D is that the effective diameter of part is 12mm, tz=3+0.5 * 12=9min, after insulation finishes, bolt changed over to immediately in 60 ℃ No. 30 machine oil and cools off, cooling time 3min;
(4) clean: at first bolt is put into the oil removing of electrochemical deoiling groove, then cleaned 10min in 90 ℃ hot water tank, last cold water cleans;
(5) tempering: NaOH crucible alkaline bath furnace is warming up to 530 ℃ (being higher than 35 ℃ of tempering temperatures), is cooled to 495 ℃ of tempering temperatures again, (the alkaline bath volume is 0.22m in the stove to add the 6.6g yellow prussiate of potash in the crucible alkaline bath furnace
3), descum is put into the tempering of crucible alkaline bath furnace with bolt, the tempering Heating temperature is 495 ℃, tempering insulation time is 15min, and insulation finishes to be transferred to water-cooled, 4 seconds transfer time, the hardness that detects support arm after the tempering is 38～39HRC, detection is deformed into linearity 0.05mm, meets design requirement surface-brightening, be light grey, directly enter follow-up electroplating work procedure.
Claims (6)
1. the bright heat treatment method of a 30CrMnSiA part is characterized in that comprising the steps:
(1) quench: in thermohaline liquid furnace in the part immersion of drying, the heating of under 880～900 ℃, quenching, Quenching Soaking Time is pressed tz=(3～5) min+ δ D and is calculated, and insulation places 20～80 ℃ machine oil to cool off part after finishing; Wherein, tz is Quenching Soaking Time, and unit is min, and δ is the Quenching Soaking Time coefficient, gets 0.4～0.7, and unit is min/mm, and D is net thickness or the diameter of part, and unit is mm;
(2) with cooled Cleaning of Parts;
(3) tempering: tempering temperature is 480～540 ℃, NaOH crucible alkaline bath furnace is warming up to be higher than 30～40 ℃ of tempering temperatures first, is cooled to tempering temperature again, before heating and in the laser heating process, according to 28～32g/m
3The ratio of h adds yellow prussiate of potash, and part is put into the tempering of crucible alkaline bath furnace, and tempering insulation time is 15～30min, and insulation is transferred to water-cooled after finishing, and is not more than 5s transfer time, and the part that hardness is qualified after the water-cooled carries out following process.
2. according to the bright heat treatment method of the described 30CrMnSiA part of claim 1, it is characterized in that: the drying means of part described in the step (1) is that part is put into after the oil removing of electrochemical deoiling groove in 150～250 ℃ of oven dry.
3. according to the bright heat treatment method of the described 30CrMnSiA part of claim 1, it is characterized in that: in the step (1), after insulation finishes, part placed 20～80 ℃ No. 20 or more than No. 30 machine oil cooling 2min.
4. according to the bright heat treatment method of the described 30CrMnSiA part of claim 1, it is characterized in that: step (2) is first part to be put into the oil removing of electrochemical deoiling groove, then cleans 10～20min in 80～100 ℃ hot water tank, and last cold water cleans.
5. according to the bright heat treatment method of the described 30CrMnSiA part of claim 1, it is characterized in that: in the step (3), the additional proportion of yellow prussiate of potash is 30g/m
3H.
6. according to the bright heat treatment method of claim 2 or 4 described 30CrMnSiA parts, it is characterized in that: the prescription of electrochemical deoiling groove is sodium hydroxide 6～10%, yellow soda ash 3～6%, water glass 1～3%, and surplus is water, and content is the quality percentage composition.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114231726A (en) * | 2021-12-23 | 2022-03-25 | 重庆交通大学 | Heat treatment method for bearing ring of automobile transfer case bearing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265514A (en) * | 2008-05-14 | 2008-09-17 | 江南机器（集团）有限公司 | Composite heat treatment method for 30CrMnSiA steel thin wall spinning cylinder-shape element |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265514A (en) * | 2008-05-14 | 2008-09-17 | 江南机器（集团）有限公司 | Composite heat treatment method for 30CrMnSiA steel thin wall spinning cylinder-shape element |
Non-Patent Citations (2)
| Title |
|---|
| 《HOT WORKING TECHNOLOGY》 20041231 李继良等 工件在碱浴炉中回火后表面产生氮化层的原因分析 第68页左栏第2段至右栏倒数第2段 1-6 , 第2期 * |
| 李继良等: "工件在碱浴炉中回火后表面产生氮化层的原因分析", 《HOT WORKING TECHNOLOGY》, no. 2, 31 December 2004 (2004-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114231726A (en) * | 2021-12-23 | 2022-03-25 | 重庆交通大学 | Heat treatment method for bearing ring of automobile transfer case bearing |
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Application publication date: 20130320 |