CN1214370A - Heat treatment process of cutter for stone work - Google Patents

Heat treatment process of cutter for stone work Download PDF

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Publication number
CN1214370A
CN1214370A CN 97107720 CN97107720A CN1214370A CN 1214370 A CN1214370 A CN 1214370A CN 97107720 CN97107720 CN 97107720 CN 97107720 A CN97107720 A CN 97107720A CN 1214370 A CN1214370 A CN 1214370A
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China
Prior art keywords
cutter hub
cutter
sodium
heat treatment
salt bath
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CN 97107720
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CN1068906C (en
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胥立华
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胥立华
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Priority to CN 97107720 priority Critical patent/CN1068906C/en
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Publication of CN1068906C publication Critical patent/CN1068906C/en
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Abstract

The cutter is first quenched, that is, the cutter is soaked in salt bath at 840+/-10 deg.C for 8-9 min, rapidly quenched in potassium nitrate of sodium nitrite bath at 290 +/- 10 deg.C for 15-18 sec while moving up and down, rapidly corrected by strong pressure in press and cooled to room temperature before being taken out, washed and dried. The quenched cutter is mounted in special tempering fixture, and tempered at 380 +/- 10 deg.C for 3-3.5 hr before being taken out and cooled to room temperature. The said technological process has small thermal stress and texture stress and is suitable for new cutters including non-standard cutters.

Description

Heat treatment process of cutter for stone work
The present invention relates to a kind of thermal treatment process, particularly relate to a kind of heat treatment process of cutter for stone work.
Heat Treatment Of Steel technology generally comprises normalizing, quenching and tempering, and wherein normalizing is that steel is heated to more than the stagnation point, and the insulation certain hour is tiny to obtain crystal grain, the austenite of uniform ingredients; Quenching is that steel is heated to proper temperature more than the stagnation point, insulation for some time, be placed on cooling fast in oil or salt, the alkali etc. then, and the austenitizing steel part is proofreaied and correct in pressurization obtained martensitic stucture simultaneously; Tempering is that the steel after quenching is reheated a certain temperature below the stagnation point, reduces or eliminates quenching stress, comprehensive mechanical property, stabilizing tissue and the size of acquisition intensity and toughness no-float." metal heat treatmet " 1997 the 7th phases are entitled as " quenching of 65Mn steel saw blade " and have introduced following thermal treatment process, at 820 ℃ saw bit matrix was heated 12 minutes, take out, quenched rapidly in 160~180 ℃ of alkaline baths about 40 seconds, take out 5 seconds of air cooling, be pressed in pressure rapidly and be that (the inner logical tap water cooling of cast iron plate this moment) is chilled to room temperature in the oil press of 20KN (2 tons of cast iron plate deadweights), with the residual alkali on the clear water flush away matrix, 200 ℃ of destressing tempering, 380 ℃ of plus-pressure tempering.The principle of its technology is, the matrix of heating of will quenching is earlier quenched in 160~180 ℃ of (this temperature be lower than below the Ms point of 65Mn steel 90~110 ℃) alkali lye, carries out marquenching, makes body portion change martensitic hardening into, carry out the pressure smoothing again, carry out destressing tempering and press tempering at last.The shortcoming of this technology is: 1) thermal stresses and structural stress are all bigger, 2) quenching guarantees its hardness earlier, just smoothing afterwards, this is quite difficult to the technical requirementss such as planeness, radial run-out and Circular Run-out Tolerance that guarantee matrix, and increase the internal stress of matrix, 3) work efficiency is low, 4) quality product is undesirable.
The object of the present invention is to provide a kind of qualification rate height, the heat treatment process of cutter for stone work that production efficiency is high.
Heat treatment process of cutter for stone work of the present invention is to realize like this, cutter hub is the 65Mn steel, thermal treatment process comprises quenching and tempering, quenching be again with cutter hub in Repone K and sodium-chlor salt bath, under 840 ± 10 ℃ of temperature, be incubated 8~9 minutes, quench rapidly afterwards in 290 ± 10 ℃ of saltpetre and the Sodium Nitrite salt bath, moved up and down 15~18 seconds, and rapidly cutter hub was put into press then, suppress correction, take out after being chilled to room temperature, clean and dry by the fire in; Tempering is that the cutter hub after quenching is packed in the special-purpose tempering anchor clamps, is incubated 3~3.5 hours under 380 ± 10 ℃ of temperature, takes out, and is cooled to room temperature.Wherein, the cooperation ratio of Repone K and sodium-chlor salt bath is sodium-chlor 50% (weight) and Repone K 50% (weight), 670 ℃ of its fusing points, 720~1000 ℃ of working temperatures; The cooperation ratio of saltpetre and Sodium Nitrite salt bath is saltpetre 55% (weight) and Sodium Nitrite 45% (weight), 137 ℃ of its fusing points, 150~500 ℃ of working temperatures.Wherein, the thermal treatment cutter hub can be new cutter hub, also can be the cutter hub (cutter hub that exceeds standard is meant the cutter hub of stone material factory processing usefulness, and behind the multiple welding carbide bit, its distortion is above standard and the cutter hub that can not continue to use) that exceeds standard.When cutter hub when exceeding standard cutter hub, need carry out following treatment step before quenching, at first check cutter hub should not have breakage or serious corrosion, the welder heats and removes carbide bit and scolder on the cutter hub then, cleans cutter hub surface and oven dry at last, carry out normalizing again, normalizing be with cutter hub in Repone K and sodium-chlor salt bath, deposit under 840 ± 10 ℃ the temperature and be incubated 8~9 minutes, take out, in air, be cooled to below 500 ℃, clean and oven dry.
The technological principle of heat treatment process of cutter for stone work of the present invention is, the heating of under 840 ± 10 ℃ temperature, quenching, during the salt made from earth containing a comparatively high percentage of sodium chloride of the temperature (290 ± 10 ℃) that is higher than above 10~30 ℃ of 65Mn steel Ms point (270 ℃) of quenching is again bathed, move 15~18 seconds second up and down, obtain uniform, performance supercooled austenite softer, that plasticity is good, rapidly cutter hub is put into press (being generally 40 t hydraulic press) afterwards, carried out the martensitic stucture conversion in suppressing down, cutter hub is chilled to room temperature in press.
The advantage of heat treatment process of cutter for stone work of the present invention is that thermal stresses and structural stress are less, thereby has guaranteed planeness, radial run-out and the Circular Run-out Tolerance of cutter hub on the one hand, and the aspect guarantees the intensity of cutter hub again simultaneously in addition.Both be suitable for new cutter hub thermal treatment, the thermal treatment of the cutter hub that also is suitable for exceeding standard.
Describe the embodiment of the invention in detail below in conjunction with accompanying drawing.
Fig. 1: the TTT curve of 65Mn steel
Embodiment 1: cutter hub is the new cutter hub of 65Mn steel, D is 1600mm, with cutter hub in 50% (weight) Repone K and 50% (weight) sodium-chlor salt bath, insulation is 9 minutes under 840 ± 10 ℃ of temperature, in 290 ± 10 ℃ of nitrate salt baths of quenching rapidly afterwards, moves up and down 15 seconds, rapidly cutter hub is put into press then, suppress correction, take out after being chilled to room temperature, clean also oven dry; Cutter hub is packed at last in the special-purpose tempering anchor clamps, insulation is 3 hours under 380 ± 10 ℃ of temperature, takes out, and is cooled to room temperature again.Thermal treatment process as shown in Figure 1, cutter hub meets the JC340-92 standard.
Embodiment 2: cutter hub is the 65Mn steel cutter hub that exceeds standard, D is 1600mm, check that at first cutter hub does not have damaged and serious corrosion, the welder heats and removes carbide bit and scolder on the cutter hub, removes surface and oil contaminant, clean and oven dry with hot water, then with cutter hub in 50% (weight) Repone K and 50% (weight) sodium-chlor salt bath, insulation is 8 minutes under 840 ± 10 ℃ temperature, takes out, in air, be cooled to below 500 ℃, clean and oven dry; Again with cutter hub in 50% (weight) Repone K and 50% (weight) and 50% (weight) sodium-chlor salt bath, deposit under 840 ± 10 ℃ of temperature and be incubated 8 minutes, quench rapidly afterwards in 290 ± 10 ℃ the saltpetre 55% (weight) and Sodium Nitrite 45% (weight) salt bath, moved up and down 18 seconds, rapidly cutter hub is put into press then, suppress correction, take out after being chilled to room temperature, clean also oven dry; Cutter hub is packed at last in the special-purpose tempering anchor clamps, insulation is 3.5 hours under 380 ± 10 ℃ of temperature, takes out, and is cooled to room temperature again.Thermal treatment process as shown in Figure 1, cutter hub meets the JC340-92 standard.
Heat treatment process of cutter for stone work of the present invention and aforementioned prior art more as shown in Figure 1, among the figure:
A--represents austenite
M--represents martensite
On behalf of martensite, Ms--begin transition temperature
A+M--represents austenite+martensitic range
Abcd--represents above-mentioned prior art processes curve, and on behalf of matrix, bc carry out martensitic transformation sclerosis (producing about 70~90% martensite) in 90~110 ℃ of (promptly 160~~180 ℃) alkali lye below the Ms point; The cd representative is behind partially hardened, and matrix is proofreaied and correct under suppressing.
Efgh--represents process curve of the present invention, and on behalf of cutter hub, fg quench to be higher than that to carry out austenite in the salt made from earth containing a comparatively high percentage of sodium chloride bath of Ms point above 10~30 ℃ (promptly 290 ± 10 ℃) cold excessively; On behalf of cutter hub, gh suppress correction under the good condition of plasticity, strengthens with advancing also to carry out martensitic transformation, and obviously, prior art is first reinforcement, post-equalization; And the present invention proofreaies and correct earlier and reinforcement simultaneously, and both principles are opposite substantially.
The JC340-92 mark:
Dmm Hardness (HRC) With sheet difference of hardness (HRC) Radial run-out mm Circular Run-out Tolerance mm
?1600 38~43 ????4 ????0.50 1 grade 2 grades
1.00 ?1.20

Claims (4)

1, a kind of heat treatment process of cutter for stone work, cutter hub is the 65Mn steel, thermal treatment process comprises quenching and tempering, it is characterized in that quenching be again with cutter hub in Repone K and sodium-chlor salt bath, under 840 ± 10 ℃ of temperature, be incubated 8~9 minutes, quench rapidly afterwards in 290 ± 10 ℃ of saltpetre and the Sodium Nitrite salt bath, moved up and down 15~18 seconds, and rapidly cutter hub was put into press then, suppress correction, take out after being chilled to room temperature, clean and oven dry; Tempering is that the cutter hub after quenching is packed in the special-purpose tempering anchor clamps, is incubated 3~3.5 hours under 380 ± 10 ℃ of temperature, takes out, and is cooled to room temperature.
2, heat treatment process of cutter for stone work as claimed in claim 1 is characterized in that the cooperation ratio of Repone K and sodium-chlor salt bath is, sodium-chlor 50% (weight) and Repone K 50% (weight); The cooperation ratio of saltpetre and Sodium Nitrite salt bath is saltpetre 55% (weight) and Sodium Nitrite 45% (weight).
3, heat treatment process of cutter for stone work as claimed in claim 1 is characterized in that cutter hub is the new cutter hub or the cutter hub that exceeds standard.
4, heat treatment process of cutter for stone work as claimed in claim 3, it is characterized in that cutter hub is when exceeding standard cutter hub, need carry out following treatment step before quenching, at first check cutter hub should not have breakage or serious corrosion, the welder heats and removes carbide bit and scolder on the cutter hub then, clean cutter hub surface and oven dry again, carry out normalizing at last, normalizing be with cutter hub in Repone K and sodium-chlor salt bath, under 840 ± 10 ℃ temperature, be incubated 8~9 minutes, take out, in air, be cooled to below 500 ℃, clean and oven dry.
CN 97107720 1997-10-15 1997-10-15 Heat treatment process of cutter for stone work Expired - Fee Related CN1068906C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 97107720 CN1068906C (en) 1997-10-15 1997-10-15 Heat treatment process of cutter for stone work

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 97107720 CN1068906C (en) 1997-10-15 1997-10-15 Heat treatment process of cutter for stone work

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CN1214370A true CN1214370A (en) 1999-04-21
CN1068906C CN1068906C (en) 2001-07-25

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103014246A (en) * 2011-09-28 2013-04-03 昆山鑫昌泰模具科技有限公司 Metal heat treatment deformation cooling calibration synchronization method
CN103131838A (en) * 2013-03-20 2013-06-05 沈阳飞机工业(集团)有限公司 Welding thermal treatment process for welding hard alloy blade tool
CN103849721A (en) * 2014-03-27 2014-06-11 奇瑞汽车股份有限公司 Control method and detection method of temper brittleness breakage of 65Mn steel lock sheet
CN104946217A (en) * 2015-06-04 2015-09-30 苏州市宝玛数控设备有限公司 Nucleating agent for low temperature fuzzy ball working solution
CN108148969A (en) * 2017-12-25 2018-06-12 江雨仙 T7 steel and its intensifying method
CN109201788A (en) * 2018-11-16 2019-01-15 南京欧瑞机械锻造有限公司 Adjust armed lever portion heat-treatment distortion correction process

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103014246A (en) * 2011-09-28 2013-04-03 昆山鑫昌泰模具科技有限公司 Metal heat treatment deformation cooling calibration synchronization method
CN103131838A (en) * 2013-03-20 2013-06-05 沈阳飞机工业(集团)有限公司 Welding thermal treatment process for welding hard alloy blade tool
CN103849721A (en) * 2014-03-27 2014-06-11 奇瑞汽车股份有限公司 Control method and detection method of temper brittleness breakage of 65Mn steel lock sheet
CN104946217A (en) * 2015-06-04 2015-09-30 苏州市宝玛数控设备有限公司 Nucleating agent for low temperature fuzzy ball working solution
CN108148969A (en) * 2017-12-25 2018-06-12 江雨仙 T7 steel and its intensifying method
CN109201788A (en) * 2018-11-16 2019-01-15 南京欧瑞机械锻造有限公司 Adjust armed lever portion heat-treatment distortion correction process

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