CN104928571A - Master cylinder insert nut and machining method thereof - Google Patents
Master cylinder insert nut and machining method thereof Download PDFInfo
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- CN104928571A CN104928571A CN201510247210.5A CN201510247210A CN104928571A CN 104928571 A CN104928571 A CN 104928571A CN 201510247210 A CN201510247210 A CN 201510247210A CN 104928571 A CN104928571 A CN 104928571A
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Abstract
The invention relates to a master cylinder insert nut and a machining method thereof and belongs to the technical field of nut machining. The master cylinder insert nut is machined by improved 10B21 steel. The improved 10B21 steel is composed of, by mass, 0.15-0.22% of C, 1.0-1.20% of Mn, 0.10% or less of Si, 0.02-0.03% of Mo, 0.001-0.002% of B, 0.05-0.2% of V, 0.02-0.06% of Nb, 0.020% or less of S, 0.020% or less of P and the balance Fe. The invention further discloses the machining method of the master cylinder insert nut. The improved 10B21 steel is machined into a semi-finished master cylinder insert nut through an ordinary mechanical roughening method. Furthermore, the method comprises heat treatment and aftertreatment of oil removing, acid pickling and rust protection, and then the finished master cylinder insert nut is obtained. The nut not only can meet the requirement for intensity and hardness of high-intensity bolt steel, but also greatly improves the plasticity and tenacity, remarkably improves the high temperature performance and corrosion resistance, increases the ductile-brittle transformation temperature, and thus is extremely suitable for fixing vehicle master cylinder inserts.
Description
Technical field
The present invention relates to a kind of nut and working method thereof, particularly relate to a kind of master cylinder insert nut and processing thereof, belong to nut processing technique field.
Background technology
Nut is exactly nut, is used for the part played the role of fastening with bolt or screw rod together with being screwed in, all manufacturing machinery must a kind of element according to the difference of material, several large types such as carbon steel, stainless steel, non-ferrous metal (as copper) can be divided into.The metallic substance that nut of the prior art is practical mostly is the very high copper alloy of copper content, but the nut hardness that this material is made is lower, and toughness is also low, cannot meet the industry of high speed development, the demand of construction industry, also cannot meet the demand of car industry.
In prior art, the chemical composition of 10B21 steel is C:0.18%-0.23%, Si≤0.10%, Mn:0.70%-1.00%, P≤0.030%, S≤0.030%, B:0.0005%-0.003%, and all the other are Fe.Nut of the present invention improves the content of Mn on the basis of existing 10B21 steel, reduces the content of C, P, S, the preferred content of B, and with the addition of Mo, V, Nb element.Because carbon content is lower, welding property and the toughness of nut are better.B mainly utilizes the solid solution B strongly inhibited ancestor of Grain Boundary Segregation to analyse ferritic transformation effect in low-carbon alloy steel.Find after deliberation, in the 10B21 steel after improvement, when B and Mo, Nb, V compound are added, better effect can be played, if when just adding separately B, segregation combines in the B of austenite grain boundary and C and Fe and forms carbide Fe23 (C, B) 6, reduces solid solution B content.And after B and Mo, Nb, V compound are added, C atom segregation tendency can be reduced, thus avoid Fe23 (C, B) 6 precipitation.In addition, add a small amount of Mo, the formation of proeutectoid ferrite can be suppressed with B, postpone proeutectoid ferrite to change, promote the formation of acicular ferrite and bainite, improve the obdurability of nut low alloy steel, simultaneously, Mo improves microalloy element Nb, V solid solubility in austenite, promotes the precipitation of microalloy carbonitride in ferrite, suitably improves the intensity of nut; Improve the thermostability of microalloy carbonitride, improve the high-temperature behavior of nut; Postpone austenite recrystallization, expand austenite Unhydrated cement.Due to the change of 10B21 steel chemical composition after improving, its microstructure also changes, and intensity, toughness, high-temperature behavior are all greatly improved, the requirement making it meet nut to work in master cylinder.In addition, the deformability that sulphur content can improve steel is reduced; Reducing phosphorus content can make the resistance to deformation of steel reduce.Therefore, reduction phosphorus, sulphur content not only can improve plasticity and toughness and the resistance for delayed fracture of steel, can also improve the processing characteristics of steel.
In above-mentioned master cylinder insert nut, as preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.16％-0.20％；Mn：1.0％-1.10％；Si≤0.10％；
Mo：0.02％-0.025％；B：0.001％-0.002％；V：0.08％-0.15％；
Nb：0.02％-0.05％；S≤0.020％；P≤0.020％；
All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.18％；Mn：1.05％；Si≤0.10％；
Mo：0.022％；B：0.0015％；V：0.10％；
Nb：0.03％；S≤0.020％；P≤0.020％；
All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.16％；Mn：1.10％；Si≤0.10％；
Mo：0.02％；B：0.002％；V：0.08％；
Nb：0.05％；S≤0.020％；P≤0.020％；
All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.20％；Mn：1.05％；Si≤0.10％；
Mo：0.025％；B：0.0015％；V：0.12％；
Nb：0.04％；S≤0.020％；P≤0.020％；
All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.22％；Mn：1.0％；Si≤0.10％；
Mo：0.03％；B：0.001％；V：0.2％；
Nb：0.02％；S≤0.020％；P≤0.020％；
All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.15％；Mn：1.20％；Si≤0.10％；
Mo：0.02％；B：0.002％；V：0.05％；
Nb：0.06％；S≤0.020％；P≤0.020％；
All the other are Fe.
Another object of the present invention is the working method providing a kind of master cylinder insert nut, described working method except adopt common mechanical rough machining method by improve after 10B21 steel be processed into master cylinder insert nut work in-process except further comprising the steps of:
(1), thermal treatment: by rough machined for machinery master cylinder insert nut work in-process first with 80-100 DEG C/h ramp to 300-350 DEG C, insulation 2-3h; Again with 60-80 DEG C/h ramp to 600-650 DEG C, insulation 2-3h; Again with 50-60 DEG C/h ramp to 1100-1200 DEG C, insulation 4-6h; 260-280 DEG C is cooled to again, insulation 2-3h with 100-120 DEG C/h speed; Again with 50-60 DEG C/h ramp to 580-620 DEG C, insulation 1-2h, then is cooled to 200-230 DEG C with 130-150 DEG C/h speed, insulation 1-2h, and last water-cooled is to room temperature;
(2) aftertreatment: oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally carries out antirust treatment, obtain master cylinder insert nut finished product.
The present invention carries out specific thermal treatment to master cylinder insert nut work in-process, greatly improves the tissue of cold pier steel, significantly reduces the cold pier problem of Cracking of cold pier steel, improves intensity, toughness, the high-temperature behavior of nut.In addition, work in-process is preserved with placing it in warehouse owing to laying in, in library procedure, metal is understood because of the different environment of surrounding, being corroded more or less, and characteristic and the impact that can affect itself after corrosion use, therefore, master cylinder insert nut use cost of the present invention is cheap, effective, and slushing oil simple to operate carries out antirust treatment to finished product nut.
Existing common mechanical roughing comprises the working method of cold forging, rough turn, throwing of shaking, boring, finish turning, the various ways such as punching press and screw thread process (rolled thread or thread rolling, tapping), and those of ordinary skill in the art can select different machining process as required.
In the working method of above-mentioned master cylinder insert nut, step (2) antirust treatment slushing oil used is made up of the component of following weight part: lanolin 1-3 part, zinc naphthenate 3-12 part, oxidation slack wax sodium barium soap 3-8 part, petroleum sodium sulfonate 0.1-0.5 part, barium mahogany sulfonate 0.1-1 part, calcium mahogany sulfonate 0.1-0.5 part, benzotriazole 3-6 part, propyl carbinol 1-10 part, rosin 3-8 part, pitch 10-20 part, gasoline 10-20 part.Slushing oil of the present invention is cheap, and consumption is few, and durations is long, practical simplicity, has excellent rust-proof effect, practical, can reduce unnecessary waste.
As preferably, described slushing oil is made up of the component of following weight part: lanolin 1-3 part, zinc naphthenate 5-10 part, oxidation slack wax sodium barium soap 4-6 part, petroleum sodium sulfonate 0.1-0.3 part, barium mahogany sulfonate 0.1-0.8 part, calcium mahogany sulfonate 0.3-0.5 part, benzotriazole 4-6 part, propyl carbinol 2-8 part, rosin 3-6 part, pitch 12-20 part, gasoline 10-18 part.
In sum, master cylinder insert nut of the present invention improves the content of Mn on the basis of common 10B21 steel, reduces the content of C, P, S, the preferred further content of B, and with the addition of Mo, V, Nb element, due to the change of chemical composition, its microstructure also changes.And specific thermal treatment is carried out to master cylinder insert nut, then carry out antirust with specific slushing oil, not only intensity, toughness are higher to make the nut of master cylinder inserts of the present invention, and high-temperature behavior is also higher, long service life, makes it extremely be suitable for fixed car master cylinder inserts.
Summary of the invention
The present invention is directed to the defect existing for prior art, not only intensity, toughness are higher to provide one, and the nut of the long service life that high-temperature behavior is also higher, is particularly suitable in master cylinder.
Above-mentioned purpose of the present invention can be implemented by the following technical programs: a kind of master cylinder insert nut, and this master cylinder insert nut is processed by the 10B21 steel after improving, and the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.15％-0.22％；Mn：1.0％-1.20％；Si≤0.10％；
Mo：0.02％-0.03％；B：0.001％-0.002％；V：0.05％-0.2％；
Nb：0.02％-0.06％；S≤0.020％；P≤0.020％；
All the other are Fe.
Embodiment
Be below specific embodiments of the invention, technical scheme of the present invention is further described, but the present invention is not limited to these embodiments.
A kind of master cylinder insert nut, this master cylinder insert nut is processed by the 10B21 steel after improving, and the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.15%-0.22%; Mn:1.0%-1.20%; Si≤0.10%; Mo:0.02%-0.03%; B:0.001%-0.002%; V:0.05%-0.2%; Nb:0.02%-0.06%; S≤0.020%; P≤0.020%; All the other are Fe.
As preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.16%-0.20%; Mn:1.0%-1.10%; Si≤0.10%; Mo:0.02%-0.025%; B:0.001%-0.002%; V:0.08%-0.15%; Nb:0.02%-0.05%; S≤0.020%; P≤0.020%; All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.18%; Mn:1.05%; Si≤0.10%; Mo:0.022%; B:0.0015%; V:0.10%; Nb:0.03%; S≤0.020%; P≤0.020%; All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.16%; Mn:1.10%; Si≤0.10%; Mo:0.02%; B:0.002%; V:0.08%; Nb:0.05%; S≤0.020%; P≤0.020%; All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.20%; Mn:1.05%; Si≤0.10%; Mo:0.025%; B:0.0015%; V:0.12%; Nb:0.04%; S≤0.020%; P≤0.020%; All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.22%; Mn:1.0%; Si≤0.10%; Mo:0.03%; B:0.001%; V:0.2%; Nb:0.02%; S≤0.020%; P≤0.020%; All the other are Fe.
Further preferably, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent: C:0.15%; Mn:1.20%; Si≤0.10%; Mo:0.02%; B:0.002%; V:0.05%; Nb:0.06%; S≤0.020%; P≤0.020%; All the other are Fe.
The present invention also provides a kind of working method of above-mentioned master cylinder insert nut, described working method except adopt common machining process by improve after 10B21 steel be processed into master cylinder insert nut work in-process except further comprising the steps of:
(1), thermal treatment: by rough machined for machinery master cylinder insert nut work in-process first with 80-100 DEG C/h ramp to 300-350 DEG C, insulation 2-3h; Again with 60-80 DEG C/h ramp to 600-650 DEG C, insulation 2-3h; Again with 50-60 DEG C/h ramp to 1100-1200 DEG C, insulation 4-6h; 260-280 DEG C is cooled to again, insulation 2-3h with 100-120 DEG C/h speed; Again with 50-60 DEG C/h ramp to 580-620 DEG C, insulation 1-2h, then is cooled to 200-230 DEG C with 130-150 DEG C/h speed, insulation 1-2h, and last water-cooled is to room temperature;
(2) aftertreatment: oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally carries out antirust treatment, obtain master cylinder insert nut finished product.
Step (2) antirust treatment slushing oil used is made up of the component of following weight part: lanolin 1-3 part, zinc naphthenate 3-12 part, oxidation slack wax sodium barium soap 3-8 part, petroleum sodium sulfonate 0.1-0.5 part, barium mahogany sulfonate 0.1-1 part, calcium mahogany sulfonate 0.1-0.5 part, benzotriazole 3-6 part, propyl carbinol 1-10 part, rosin 3-8 part, pitch 10-20 part, gasoline 10-20 part.
As preferably, described slushing oil is made up of the component of following weight part: lanolin 1-3 part, zinc naphthenate 5-10 part, oxidation slack wax sodium barium soap 4-6 part, petroleum sodium sulfonate 0.1-0.3 part, barium mahogany sulfonate 0.1-0.8 part, calcium mahogany sulfonate 0.3-0.5 part, benzotriazole 4-6 part, propyl carbinol 2-8 part, rosin 3-6 part, pitch 12-20 part, gasoline 10-18 part.
Embodiment 1
10B21 steel after improving successively is obtained master cylinder insert nut work in-process through the cold pier of multi-work-station, throwing of shaking, flat head drill, punching press, tapping, and wherein, the 10B21 steel after improvement is made up of the chemical composition of following mass percent: C:0.18%; Mn:1.05%; Si≤0.10%; Mo:0.022%; B:0.0015%; V:0.10%; Nb:0.03%; S≤0.020%; P≤0.020%; All the other are Fe.
By master cylinder insert nut work in-process first with 90 DEG C/h ramp to 320 DEG C, insulation 2.5h; Again with 70 DEG C/h ramp to 620 DEG C, insulation 2.5h; Again with 55 DEG C/h ramp to 1150 DEG C, insulation 5h; 270 DEG C are cooled to again, insulation 2.5h with 110 DEG C/h speed; Again with 55 DEG C/h ramp to 600 DEG C, insulation 1.5h, then be cooled to 220 DEG C with 140 DEG C/h speed, insulation 1.5h, last water-cooled is to room temperature.
Oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally adopts specific slushing oil to carry out antirust treatment, final master cylinder insert nut finished product; Wherein, specific slushing oil is made up of the component of following weight part: 2 parts, lanolin, zinc naphthenate 8 parts, oxidation slack wax sodium barium soap 5 parts, petroleum sodium sulfonate 0.2 part, barium mahogany sulfonate 0.8 part, calcium mahogany sulfonate 0.3 part, benzotriazole 4 parts, propyl carbinol 6 parts, rosin 5 parts, pitch 15 parts, 15 parts, gasoline.
Embodiment 2
10B21 steel after improving successively is obtained master cylinder insert nut work in-process through the cold pier of multi-work-station, throwing of shaking, flat head drill, punching press, tapping, and wherein, the 10B21 steel after improvement is made up of the chemical composition of following mass percent: C:0.16%; Mn:1.10%; Si≤0.10%; Mo:0.02%; B:0.002%; V:0.08%; Nb:0.05%; S≤0.020%; P≤0.020%; All the other are Fe.
By master cylinder insert nut work in-process first with 85 DEG C/h ramp to 330 DEG C, insulation 2.5h; Again with 65 DEG C/h ramp to 630 DEG C, insulation 2h; Again with 58 DEG C/h ramp to 1120 DEG C, insulation 4.5h; 275 DEG C are cooled to again, insulation 2.5h with 105 DEG C/h speed; Again with 58 DEG C/h ramp to 610 DEG C, insulation 1-2h, then be cooled to 210 DEG C with 135 DEG C/h speed, insulation 1.5h, last water-cooled is to room temperature.
Oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally adopts specific slushing oil to carry out antirust treatment, final master cylinder insert nut finished product; Wherein, specific slushing oil is made up of the component of following weight part: 2 parts, lanolin, zinc naphthenate 5 parts, oxidation slack wax sodium barium soap 6 parts, petroleum sodium sulfonate 0.3 part, barium mahogany sulfonate 0.5 part, calcium mahogany sulfonate 0.2 part, benzotriazole 5 parts, propyl carbinol 8 parts, rosin 4 parts, pitch 12 parts, 18 parts, gasoline.
Embodiment 3
10B21 steel after improving successively is obtained master cylinder insert nut work in-process through the cold pier of multi-work-station, throwing of shaking, flat head drill, punching press, tapping, and wherein, the 10B21 steel after improvement is made up of the chemical composition of following mass percent: C:0.20%; Mn:1.05%; Si≤0.10%; Mo:0.025%; B:0.0015%; V:0.12%; Nb:0.04%; S≤0.020%; P≤0.020%; All the other are Fe.
By master cylinder insert nut work in-process first with 95 DEG C/h ramp to 340 DEG C, insulation 3h; Again with 60-80 DEG C/h ramp to 600-650 DEG C, insulation 2h; Again with 52 DEG C/h ramp to 1180 DEG C, insulation 5h; 265 DEG C are cooled to again, insulation 2h with 115 DEG C/h speed; Again with 53 DEG C/h ramp to 590 DEG C, insulation 2h, then be cooled to 225 DEG C with 145 DEG C/h speed, insulation 1h, last water-cooled is to room temperature.
Oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally adopts specific slushing oil to carry out antirust treatment, final master cylinder insert nut finished product; Wherein, specific slushing oil is made up of the component of following weight part: 3 parts, lanolin, zinc naphthenate 10 parts, oxidation slack wax sodium barium soap 4 parts, petroleum sodium sulfonate 0.4 part, barium mahogany sulfonate 0.4 part, calcium mahogany sulfonate 0.4 part, benzotriazole 5 parts, propyl carbinol 3 parts, rosin 6 parts, pitch 18 parts, 12 parts, gasoline.
Embodiment 4
10B21 steel after improving successively is obtained master cylinder insert nut work in-process through the cold pier of multi-work-station, throwing of shaking, flat head drill, punching press, tapping, and wherein, the 10B21 steel after improvement is made up of the chemical composition of following mass percent: C:0.22%; Mn:1.0%; Si≤0.10%; Mo:0.03%; B:0.001%; V:0.2%; Nb:0.02%; S≤0.020%; P≤0.020%; All the other are Fe.
By master cylinder insert nut work in-process first with 80 DEG C/h ramp to 300 DEG C, insulation 3h; Again with 80 DEG C/h ramp to 650 DEG C, insulation 2h; Again with 60 DEG C/h ramp to 1100 DEG C, insulation 4h; 280 DEG C are cooled to again, insulation 2h with 120 DEG C/h speed; Again with 50 DEG C/h ramp to 580 DEG C, insulation 2h, then be cooled to 230 DEG C with 150 DEG C/h speed, insulation 1h, last water-cooled is to room temperature.
Oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally adopts specific slushing oil to carry out antirust treatment, final master cylinder insert nut finished product; Wherein, specific slushing oil is made up of the component of following weight part: 1 part, lanolin, zinc naphthenate 12 parts, oxidation slack wax sodium barium soap 3 parts, petroleum sodium sulfonate 0.5 part, barium mahogany sulfonate 0.1 part, calcium mahogany sulfonate 0.5 part, benzotriazole 3 parts, propyl carbinol 10 parts, rosin 3 parts, pitch 20 parts, 10 parts, gasoline.
Embodiment 5
10B21 steel after improving successively is obtained master cylinder insert nut work in-process through the cold pier of multi-work-station, throwing of shaking, flat head drill, punching press, tapping, and wherein, the 10B21 steel after improvement is made up of the chemical composition of following mass percent: C:0.15%; Mn:1.20%; Si≤0.10%; Mo:0.02%; B:0.002%; V:0.05%; Nb:0.06%; S≤0.020%; P≤0.020%; All the other are Fe.
By master cylinder insert nut work in-process first with 100 DEG C/h ramp to 350 DEG C, insulation 2h; Again with 60 DEG C/h ramp to 600 DEG C, insulation 3h; Again with 60 DEG C/h ramp to 1200 DEG C, insulation 4h; 260 DEG C are cooled to again, insulation 3h with 100 DEG C/h speed; Again with 60 DEG C/h ramp to 620 DEG C, insulation 1h, then be cooled to 200 DEG C with 130 DEG C/h speed, insulation 2h, last water-cooled is to room temperature.
Oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally adopts specific slushing oil to carry out antirust treatment, final master cylinder insert nut finished product; Wherein, specific slushing oil is made up of the component of following weight part: 3 parts, lanolin, zinc naphthenate 3 parts, oxidation slack wax sodium barium soap 8 parts, petroleum sodium sulfonate 0.1 part, barium mahogany sulfonate 1 part, calcium mahogany sulfonate 0.1 part, benzotriazole 6 parts, propyl carbinol 1 part, rosin 8 parts, pitch 10 parts, 20 parts, gasoline.
Detect tensile strength sigma b, the hardness HRC of the nut of embodiment 1-5, surface hardness HRC and toughness (impact absorbing energy Akv), detected result is as shown in table 1:
The performance test results of the nut obtained by common processing methods with 10B21 steel in the nut of table 1: embodiment 1-4 and prior art
As can be seen from Table 1, nut of the present invention not only can reach the requirement of high strength bolting steel in intensity and hardness, also drastically increase the plasticity of nut, toughness, and significantly improve the high-temperature behavior of nut and solidity to corrosion and tough-crisp invert point, make it extremely be suitable for fixed car master cylinder inserts.
Above embodiment is only for illustration of technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (4)
1. a master cylinder insert nut, is characterized in that, this master cylinder insert nut is processed by the 10B21 steel after improving, and the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.15％-0.22％； Mn：1.0％-1.20％； Si≤0.10％；
Mo：0.02％-0.03％； B：0.001％-0.002％； V：0.05％-0.2％；
Nb：0.02％-0.06％； S≤0.020％； P≤0.020％；
All the other are Fe.
2. master cylinder insert nut according to claim 1, is characterized in that, the 10B21 steel after described improvement is made up of the chemical composition of following mass percent:
C：0.16％-0.20％； Mn：1.0％-1.10％； Si≤0.10％；
Mo：0.02％-0.025％； B：0.001％-0.002％； V：0.08％-0.15％；
Nb：0.02％-0.05％； S≤0.020％； P≤0.020％；
All the other are Fe.
3. a working method for master cylinder insert nut, is characterized in that, described working method except adopt common mechanical rough machining method by improve after 10B21 steel be processed into master cylinder insert nut work in-process except further comprising the steps of:
(1), thermal treatment: by rough machined for machinery master cylinder insert nut work in-process first with 80-100 DEG C/h ramp to 300-350 DEG C, insulation 2-3h; Again with 60-80 DEG C/h ramp to 600-650 DEG C, insulation 2-3h; Again with 50-60 DEG C/h ramp to 1100-1200 DEG C, insulation 4-6h; 260-280 DEG C is cooled to again, insulation 2-3h with 100-120 DEG C/h speed; Again with 50-60 DEG C/h ramp to 580-620 DEG C, insulation 1-2h, then is cooled to 200-230 DEG C with 130-150 DEG C/h speed, insulation 1-2h, and last water-cooled is to room temperature;
(2) aftertreatment: oil removing, acid pickling and rust removing are carried out to the master cylinder insert nut work in-process after thermal treatment, finally carries out antirust treatment, obtain master cylinder insert nut finished product.
4. the working method of master cylinder insert nut according to claim 3, it is characterized in that, step (2) antirust treatment slushing oil used is made up of the component of following weight part: lanolin 1-3 part, zinc naphthenate 3-12 part, oxidation slack wax sodium barium soap 3-8 part, petroleum sodium sulfonate 0.1-0.5 part, barium mahogany sulfonate 0.1-1 part, calcium mahogany sulfonate 0.1-0.5 part, benzotriazole 3-6 part, propyl carbinol 1-10 part, rosin 3-8 part, pitch 10-20 part, gasoline 10-20 part.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09263876A (en) * | 1996-03-29 | 1997-10-07 | Nippon Steel Corp | High strength steel for machine structural use, excellent in delayed fracture characteristic, and its production |
| JP2007023310A (en) * | 2005-07-12 | 2007-02-01 | Kobe Steel Ltd | Steel for machine structural use |
| JP2013007089A (en) * | 2011-06-23 | 2013-01-10 | Kobe Steel Ltd | Steel for mechanical structure for cold working, method for manufacturing the same, and component for mechanical structure |
| CN102943207A (en) * | 2012-11-09 | 2013-02-27 | 谢亚平 | High-strength fastener and processing method thereof |
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2015
- 2015-05-14 CN CN201510247210.5A patent/CN104928571B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09263876A (en) * | 1996-03-29 | 1997-10-07 | Nippon Steel Corp | High strength steel for machine structural use, excellent in delayed fracture characteristic, and its production |
| JP2007023310A (en) * | 2005-07-12 | 2007-02-01 | Kobe Steel Ltd | Steel for machine structural use |
| JP2013007089A (en) * | 2011-06-23 | 2013-01-10 | Kobe Steel Ltd | Steel for mechanical structure for cold working, method for manufacturing the same, and component for mechanical structure |
| CN102943207A (en) * | 2012-11-09 | 2013-02-27 | 谢亚平 | High-strength fastener and processing method thereof |
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