CN105149866A - Method for machining high-strength T-shaped bolt - Google Patents
Method for machining high-strength T-shaped bolt Download PDFInfo
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- CN105149866A CN105149866A CN201510418093.4A CN201510418093A CN105149866A CN 105149866 A CN105149866 A CN 105149866A CN 201510418093 A CN201510418093 A CN 201510418093A CN 105149866 A CN105149866 A CN 105149866A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000003754 machining Methods 0.000 title abstract 3
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000000137 annealing Methods 0.000 claims description 54
- 238000010791 quenching Methods 0.000 claims description 31
- 230000000171 quenching effect Effects 0.000 claims description 25
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 20
- 238000005496 tempering Methods 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 238000005530 etching Methods 0.000 claims description 16
- 230000000415 inactivating effect Effects 0.000 claims description 16
- 238000002161 passivation Methods 0.000 claims description 16
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000003672 processing method Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 10
- 239000004925 Acrylic resin Substances 0.000 claims description 8
- 229920000178 Acrylic resin Polymers 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 8
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 239000000470 constituent Substances 0.000 claims description 8
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 8
- 229940043237 diethanolamine Drugs 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 239000011733 molybdenum Substances 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 235000010344 sodium nitrate Nutrition 0.000 claims description 8
- 239000004317 sodium nitrate Substances 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005554 pickling Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000010000 carbonizing Methods 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention provides a method for machining a high-strength T-shaped bolt. The method includes the machining step that a rod material blank is cast, and the rod material blank should be controlled to comprise, by weight, 0.38-0.52 part of C, 0.32-0.48 part of Mn, 0.08-0.12 part of V, 0.14-0.25 part of Si, 0.01-0.04 part of W, 0-0.025 part of P, 0-0.03 part of S, 0.06-0.12 part of Ni, 0.25-0.38 part of Sn, 0.22-0.34 part of Cu, 0.24-0.38 part of Al, 0.002-0.004 part of B, 0.015-0.027 part of Pt, 0.004-0.006 part of Zr, 0.07-0.12 part of Cr and 90-100 parts of Fe. According to the high-strength bolt, the overall strength of the bolt is improved, bolt precision is high, quality is good, the tensile strength of the bolt is greatly improved, and the service life of the bolt is prolonged; meanwhile, abrasion resistance and fatigue resistance can be achieved.
Description
Technical field
The present invention relates to the processing method of bolt, especially a kind of processing method of high strength tommyhead bolt.
Background technology
Bolt is a kind of application accessory widely, and from Aero-Space to daily life, all be unable to do without it, according to the difference of intensity, bolt can be divided into plain bolt and high-strength bolt.Compared with plain bolt, high-strength bolt has many advantages: the Assembling used time is short, little impact on production, long service life, and suitable member scope is wide, connects safe and reliable, has good manufacturability and economy.Exactly because these advantages of high-strength bolt, there is phenomenon high strength bolting steel and high-strength bolt being concentrated to research in industrially developed country in recent years, and have developed a series of superhigh intensity bolting steel and superhigh intensity bolt.
Chinese patent application (publication number: CN101890618A) relates to a kind of processing method of high-strength bolt, the method adopts SCM440 and 42CrMoVNb material to produce, pass through selection, the gauge or diameter of wire needed for line is taken out in wire rod nodularization, pickling, through head dummy and the bar portion of 3 ~ 4 extruded required bolts on multistation cold forging machine, rub required screw thread and reach through rolling threading.Required hardness and intensity is got to through heat-treatment quenching tempering.Although adopt this processing method can obtain intensity and hardness reaches 12.9 and 14.9 grade high-strength bolts, its plasticity and toughness still cannot reach the requirement of high-strength bolt.
Summary of the invention
For solving the problem, the invention discloses a kind of processing method of high strength tommyhead bolt.
In order to reach above object, the invention provides following technical scheme:
A processing method for high strength tommyhead bolt, comprises following procedure of processing:
(1) cast bar material blank: the parts by weight of each chemical composition of control lever material blank should meet following requirement: C0.38 ~ 0.52, Mn0.32 ~ 0.48, V0.08 ~ 0.12, Si0.14 ~ 0.25, W0.01 ~ 0.04, P≤0.025, S≤0.03, Ni0.06 ~ 0.12, Sn0.25 ~ 0.38, Cu0.22 ~ 0.34, Al0.24 ~ 0.38, B0.002 ~ 0.004, Pt0.015 ~ 0.027, Zr0.004 ~ 0.006, Cr0.07 ~ 0.12, Fe90 ~ 100;
(2) get the raw materials ready: the Bear-grudge material after casting does pickling processes, alkali cleaning process, and intercepts the cylinder blank of suitable size according to the specification size of bolt.
(3) soft annealing; Soft annealing is divided into twice, be specially: a soft annealing: cylinder blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 800 ~ 850 DEG C, and temperature retention time is 7 ~ 8 hours, and its hardness controls be less than HB120, control methanol flow 25 ~ 30ml/min, gas flow 0.1 ~ 0.15Nm3/h, secondary soft annealing: annealing temperature is 650 ~ 700 DEG C, time 5 ~ 6h, add alcohol flow 20 ~ 25ml/min, gas flow 0.1 ~ 0.15Nm3/h;
(4) cold-forge forming: according to the wire diameter requirement of bolt, take out line to it, expects to make described cylindrical Bear-grudge the wire diameter be retracted to needed for bolt; Cylindrical Bear-grudge after contraction wire diameter is expected the length be cut to needed for bolt, at normal temperatures the cylindrical Bear-grudge material after cut-out is put into the mold cavity being coated with plant ash, make cylindrical Bear-grudge expect to form the head needed for bolt and bar portion size with upset force, at room temperature select screw-rolling machine to carry out thread forming;
(5) heat treatment: by bolt external screw thread at 650 DEG C, quench with quenching oil, again the bolt after quenching is carried out tempering, 70 ~ 80 minutes duration, by the polished rod section 850 DEG C of bolt at 400 DEG C, use quenching liquid quenches, again the bolt after quenching is carried out tempering at 450 DEG C, 60 ~ 70 minutes duration, finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 90 ~ 110min in 1200 ~ 1250 DEG C of temperature ranges;
(6) Passivation Treatment, bolt after heat treatment being immersed temperature is process 4 ~ 5min in the inactivating treatment liquid of 100 ~ 120 DEG C, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 ~ 6 parts of water-soluble molybdenum hydrochlorates, 10 ~ 12 parts of diethanol amine, 80 ~ 100 parts of alkaline silica sols, 90 ~ 100 parts of water soluble acrylic resins, 90 ~ 100 parts of water;
(7) phosphorating treatment, bolt after Passivation Treatment is put into 50 ~ 60 DEG C of etching solutions and soak 3 ~ 5min, carry out again cleaning, air-dry, get product bolt, wherein the weight portion of each constituent of etching solution is: 70 ~ 80 parts of polyethylene glycol, 30 ~ 35 parts of Mazhev salts, 5 ~ 6 parts of sodium nitrate, 2.5 ~ 3.5 parts of ferric trichlorides, 100 ~ 120 parts of water;
(8) blackening process, carries out blackening process to bolt, control temperature 115 ~ 125 DEG C; 25 ~ 30 minutes time; Carry out again cleaning, air-dry, get product bolt.
As preferably, step (3) described soft annealing is divided into twice, be specially: a soft annealing: blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 830 DEG C, temperature retention time is 7.5 hours, and its hardness controls be less than HB120, controls methanol flow 30ml/min, gas flow 0.12Nm3/h, to prevent case-carbonizing; Secondary soft annealing: annealing temperature is 680 DEG C, time 5.5h, adds alcohol flow 23ml/min, gas flow 0.12Nm3/h.
As preferably, step (6) described Passivation Treatment is specially: it is process 5min in the inactivating treatment liquid of 110 DEG C that the bolt after heat treatment is immersed temperature, and described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine, 90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water.
As preferably, step (7) described phosphorating treatment is specially, bolt after Passivation Treatment is put into 55 DEG C of etching solutions and soak 4min, carry out again cleaning, air-dry, get product bolt, and wherein the weight portion of each constituent of etching solution is: 75 parts of polyethylene glycol, 32 parts of Mazhev salts, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water.
The beneficial effect that the present invention obtains is: improve bolt bulk strength, bolt precision is high, quality is good, substantially increase its tensile strength, while improving bolt service life, can also wear-resistant, endurance, make the connection of use procedure safe and reliable, not easily because the problem such as to fracture meets accident accident.
Detailed description of the invention
Below in conjunction with detailed description of the invention, illustrate the present invention further, following detailed description of the invention should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Table 1: the chemical composition (by mass fraction) of high strength tommyhead bolt of the present invention Bear-grudge material used
Embodiment 1
The processing method of high strength tommyhead bolt, comprises following procedure of processing:
(1) according to chemical composition and the percent mass proportioning casting bar material blank of embodiment in table 11;
(2) get the raw materials ready: the Bear-grudge material after casting does pickling processes, alkali cleaning process, and intercepts the cylinder blank of suitable size according to the specification size of bolt.
(3) soft annealing; Soft annealing is divided into twice, be specially: a soft annealing: cylinder blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 800 DEG C, and temperature retention time is 7 hours, and its hardness controls be less than HB120, control methanol flow 25ml/min, gas flow 0.1Nm3/h, secondary soft annealing: annealing temperature is 650 DEG C, time 5 ~ 6h, add alcohol flow 20ml/min, gas flow 0.1Nm3/h;
(4) cold-forge forming: according to the wire diameter requirement of bolt, take out line to it, expects to make described cylindrical Bear-grudge the wire diameter be retracted to needed for bolt; Cylindrical Bear-grudge after contraction wire diameter is expected the length be cut to needed for bolt, at normal temperatures the cylindrical Bear-grudge material after cut-out is put into the mold cavity being coated with plant ash, make cylindrical Bear-grudge expect to form the head needed for bolt and bar portion size with upset force, at room temperature select screw-rolling machine to carry out thread forming;
(5) heat treatment: by bolt external screw thread at 650 DEG C, quench with quenching oil, again the bolt after quenching is carried out tempering, 70 minutes duration, by the polished rod section 850 DEG C of bolt at 400 DEG C, use quenching liquid quenches, again the bolt after quenching is carried out tempering at 450 DEG C, 60 minutes duration, finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 90min in 1200 ~ 1250 DEG C of temperature ranges;
(6) Passivation Treatment, it is process 4min in the inactivating treatment liquid of 100 DEG C that bolt after heat treatment is immersed temperature, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 parts of water-soluble molybdenum hydrochlorates, 10 parts of diethanol amine, 80 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water;
(7) phosphorating treatment, bolt after Passivation Treatment is put into 50 DEG C of etching solutions and soak 3min, carry out again cleaning, air-dry, get product bolt, wherein the weight portion of each constituent of etching solution is: 70 parts of polyethylene glycol, 30 parts of Mazhev salts, 5 parts of sodium nitrate, 2.5 parts of ferric trichlorides, 100 parts of water;
(8) blackening process, carries out blackening process to bolt, control temperature 115 DEG C; 25 minutes time; Carry out again cleaning, air-dry, get product bolt.
Embodiment 2
The processing method of high strength tommyhead bolt, comprises following procedure of processing:
(1) according to chemical composition and the percent mass proportioning casting bar material blank of embodiment in table 12;
(2) get the raw materials ready: the Bear-grudge material after casting does pickling processes, alkali cleaning process, and intercepts the cylinder blank of suitable size according to the specification size of bolt.
(3) soft annealing; Soft annealing is divided into twice, be specially: a soft annealing: cylinder blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 850 DEG C, and temperature retention time is 8 hours, and its hardness controls be less than HB120, control methanol flow 30ml/min, gas flow 0.15Nm3/h, secondary soft annealing: annealing temperature is 700 DEG C, time 6h, add alcohol flow 25ml/min, gas flow 0.15Nm3/h;
(4) cold-forge forming: according to the wire diameter requirement of bolt, take out line to it, expects to make described cylindrical Bear-grudge the wire diameter be retracted to needed for bolt; Cylindrical Bear-grudge after contraction wire diameter is expected the length be cut to needed for bolt, at normal temperatures the cylindrical Bear-grudge material after cut-out is put into the mold cavity being coated with plant ash, make cylindrical Bear-grudge expect to form the head needed for bolt and bar portion size with upset force, at room temperature select screw-rolling machine to carry out thread forming;
(5) heat treatment: by bolt external screw thread at 650 DEG C, quench with quenching oil, again the bolt after quenching is carried out tempering, 80 minutes duration, by the polished rod section 850 DEG C of bolt at 400 DEG C, use quenching liquid quenches, again the bolt after quenching is carried out tempering at 450 DEG C, 70 minutes duration, finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 110min in 1250 DEG C of temperature ranges;
(6) Passivation Treatment, it is process 5min in the inactivating treatment liquid of 120 DEG C that bolt after heat treatment is immersed temperature, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 6 parts of water-soluble molybdenum hydrochlorates, 12 parts of diethanol amine, 100 parts of alkaline silica sols, 100 parts of water soluble acrylic resins, 100 parts of water;
(7) phosphorating treatment, bolt after Passivation Treatment is put into 60 DEG C of etching solutions and soak 5min, carry out again cleaning, air-dry, get product bolt, wherein the weight portion of each constituent of etching solution is: 80 parts of polyethylene glycol, 35 parts of Mazhev salts, 6 parts of sodium nitrate, 3.5 parts of ferric trichlorides, 120 parts of water;
(8) blackening process, carries out blackening process to bolt, control temperature 125 DEG C; 30 minutes time; Carry out again cleaning, air-dry, get product bolt.
Embodiment 3
The processing method of high strength tommyhead bolt, comprises following procedure of processing:
(1) according to chemical composition and the percent mass proportioning casting bar material blank of embodiment in table 13;
(2) get the raw materials ready: the Bear-grudge material after casting does pickling processes, alkali cleaning process, and intercepts the cylinder blank of suitable size according to the specification size of bolt.
(3) soft annealing; Soft annealing is divided into twice, be specially: a soft annealing: blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 830 DEG C, temperature retention time is 7.5 hours, its hardness controls be less than HB120, control methanol flow 30ml/min, gas flow 0.12Nm3/h, to prevent case-carbonizing; Secondary soft annealing: annealing temperature is 680 DEG C, time 5.5h, adds alcohol flow 23ml/min, gas flow 0.12Nm3/h;
(4) cold-forge forming: according to the wire diameter requirement of bolt, take out line to it, expects to make described cylindrical Bear-grudge the wire diameter be retracted to needed for bolt; Cylindrical Bear-grudge after contraction wire diameter is expected the length be cut to needed for bolt, at normal temperatures the cylindrical Bear-grudge material after cut-out is put into the mold cavity being coated with plant ash, make cylindrical Bear-grudge expect to form the head needed for bolt and bar portion size with upset force, at room temperature select screw-rolling machine to carry out thread forming;
(5) heat treatment: by bolt external screw thread at 650 DEG C, quench with quenching oil, again the bolt after quenching is carried out tempering, 80 minutes duration, by the polished rod section 850 DEG C of bolt at 400 DEG C, use quenching liquid quenches, again the bolt after quenching is carried out tempering at 450 DEG C, 65 minutes duration, finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 100min in 1230 DEG C of temperature ranges;
(6) Passivation Treatment, it is process 5min in the inactivating treatment liquid of 110 DEG C that bolt after heat treatment is immersed temperature, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine, 90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water;
(7) phosphorating treatment, bolt after Passivation Treatment is put into 55 DEG C of etching solutions and soak 4min, carry out again cleaning, air-dry, get product bolt, wherein the weight portion of each constituent of etching solution is: 75 parts of polyethylene glycol, 32 parts of Mazhev salts, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water;
(8) blackening process, carries out blackening process to bolt, control temperature 120 DEG C; 30 minutes time; Carry out again cleaning, air-dry, get product bolt.
Embodiment 4
The processing method of high strength tommyhead bolt, comprises following procedure of processing:
(1) according to chemical composition and the percent mass proportioning casting bar material blank of embodiment in table 14;
(2) get the raw materials ready: the Bear-grudge material after casting does pickling processes, alkali cleaning process, and intercepts the cylinder blank of suitable size according to the specification size of bolt.
(3) soft annealing; Soft annealing is divided into twice, be specially: a soft annealing: blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 830 DEG C, temperature retention time is 7.5 hours, its hardness controls be less than HB120, control methanol flow 30ml/min, gas flow 0.12Nm3/h, to prevent case-carbonizing; Secondary soft annealing: annealing temperature is 680 DEG C, time 5.5h, adds alcohol flow 23ml/min, gas flow 0.12Nm3/h;
(4) cold-forge forming: according to the wire diameter requirement of bolt, take out line to it, expects to make described cylindrical Bear-grudge the wire diameter be retracted to needed for bolt; Cylindrical Bear-grudge after contraction wire diameter is expected the length be cut to needed for bolt, at normal temperatures the cylindrical Bear-grudge material after cut-out is put into the mold cavity being coated with plant ash, make cylindrical Bear-grudge expect to form the head needed for bolt and bar portion size with upset force, at room temperature select screw-rolling machine to carry out thread forming;
(5) heat treatment: by bolt external screw thread at 650 DEG C, quench with quenching oil, again the bolt after quenching is carried out tempering, 80 minutes duration, by the polished rod section 850 DEG C of bolt at 400 DEG C, use quenching liquid quenches, again the bolt after quenching is carried out tempering at 450 DEG C, 65 minutes duration, finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 100min in 1230 DEG C of temperature ranges;
(6) Passivation Treatment, it is process 5min in the inactivating treatment liquid of 110 DEG C that bolt after heat treatment is immersed temperature, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine, 90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water;
(7) phosphorating treatment, bolt after Passivation Treatment is put into 55 DEG C of etching solutions and soak 4min, carry out again cleaning, air-dry, get product bolt, wherein the weight portion of each constituent of etching solution is: 75 parts of polyethylene glycol, 32 parts of Mazhev salts, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water;
(8) blackening process, carries out blackening process to bolt, control temperature 120 DEG C; 30 minutes time; Carry out again cleaning, air-dry, get product bolt.
Embodiment 5
According to the high strength tommyhead bolt that the processing method of embodiment 1 ~ 4 obtains, its mechanical performance is as shown in table 2 after testing:
Table 2: the mechanical performance of high-strength bolt of the present invention
| Tensile strength Mpa | Yield strength Mpa | Vickers intensity (HV) | Rockwell intensity (HR) | Elongation after fracture | To have no progeny expansion and contraction | |
| Embodiment 1 | ≥1566 | ≥1364 | 456～471 | 42～45 | ≥11 | ≥52 |
| Embodiment 2 | ≥1581 | ≥1372 | 464～483 | 43～45 | ≥12 | ≥54 |
| Embodiment 3 | ≥1527 | ≥1355 | 455～468 | 42～44 | ≥10 | ≥52 |
| Embodiment 4 | ≥1573 | ≥1368 | 462～481 | 41～43 | ≥12 | ≥53 |
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also comprises the technical scheme be made up of above technical characteristic.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (4)
1. a processing method for high strength tommyhead bolt, is characterized in that, comprises following procedure of processing:
(1) cast bar material blank: the parts by weight of each chemical composition of control lever material blank should meet following requirement: C0.38 ~ 0.52, Mn0.32 ~ 0.48, V0.08 ~ 0.12, Si0.14 ~ 0.25, W0.01 ~ 0.04, P≤0.025, S≤0.03, Ni0.06 ~ 0.12, Sn0.25 ~ 0.38, Cu0.22 ~ 0.34, Al0.24 ~ 0.38, B0.002 ~ 0.004, Pt0.015 ~ 0.027, Zr0.004 ~ 0.006, Cr0.07 ~ 0.12, Fe90 ~ 100;
(2) get the raw materials ready: the Bear-grudge material after casting does pickling processes, alkali cleaning process, and intercepts the cylinder blank of suitable size according to the specification size of bolt;
(3) soft annealing; Soft annealing is divided into twice, be specially: a soft annealing: cylinder blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 800 ~ 850 DEG C, and temperature retention time is 7 ~ 8 hours, and its hardness controls be less than HB120, control methanol flow 25 ~ 30ml/min, gas flow 0.1 ~ 0.15Nm3/h, secondary soft annealing: annealing temperature is 650 ~ 700 DEG C, time 5 ~ 6h, add alcohol flow 20 ~ 25ml/min, gas flow 0.1 ~ 0.15Nm3/h;
(4) cold-forge forming: according to the wire diameter requirement of bolt, take out line to it, expects to make described cylindrical Bear-grudge the wire diameter be retracted to needed for bolt; Cylindrical Bear-grudge after contraction wire diameter is expected the length be cut to needed for bolt, at normal temperatures the cylindrical Bear-grudge material after cut-out is put into the mold cavity being coated with plant ash, make cylindrical Bear-grudge expect to form the head needed for bolt and bar portion size with upset force, at room temperature select screw-rolling machine to carry out thread forming;
(5) heat treatment: by bolt external screw thread at 650 DEG C, quench with quenching oil, again the bolt after quenching is carried out tempering, 70 ~ 80 minutes duration, by the polished rod section 850 DEG C of bolt at 400 DEG C, use quenching liquid quenches, again the bolt after quenching is carried out tempering at 450 DEG C, 60 ~ 70 minutes duration, finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 90 ~ 110min in 1200 ~ 1250 DEG C of temperature ranges;
(6) Passivation Treatment, bolt after heat treatment being immersed temperature is process 4 ~ 5min in the inactivating treatment liquid of 100 ~ 120 DEG C, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 ~ 6 parts of water-soluble molybdenum hydrochlorates, 10 ~ 12 parts of diethanol amine, 80 ~ 100 parts of alkaline silica sols, 90 ~ 100 parts of water soluble acrylic resins, 90 ~ 100 parts of water;
(7) phosphorating treatment, bolt after Passivation Treatment is put into 50 ~ 60 DEG C of etching solutions and soak 3 ~ 5min, carry out again cleaning, air-dry, get product bolt, wherein the weight portion of each constituent of etching solution is: 70 ~ 80 parts of polyethylene glycol, 30 ~ 35 parts of Mazhev salts, 5 ~ 6 parts of sodium nitrate, 2.5 ~ 3.5 parts of ferric trichlorides, 100 ~ 120 parts of water;
(8) blackening process, carries out blackening process to bolt, control temperature 115 ~ 125 DEG C; 25 ~ 30 minutes time; Carry out again cleaning, air-dry, get product bolt.
2. high-strength bolt as claimed in claim 1, it is characterized in that: step (3) described soft annealing is divided into twice, be specially: a soft annealing: blank is carried out isothermal soft annealing in clock hood type furnace, softening annealing temperature is 830 DEG C, temperature retention time is 7.5 hours, and its hardness controls be less than HB120, controls methanol flow 30ml/min, gas flow 0.12Nm3/h, to prevent case-carbonizing; Secondary soft annealing: annealing temperature is 680 DEG C, time 5.5h, adds alcohol flow 23ml/min, gas flow 0.12Nm3/h.
3. high-strength bolt as claimed in claim 1, it is characterized in that: step (6) described Passivation Treatment is specially: it is process 5min in the inactivating treatment liquid of 110 DEG C that the bolt after heat treatment is immersed temperature, described inactivating treatment liquid is mixed with by the material of following weight proportioning to form: 5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine, 90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water.
4. high-strength bolt as claimed in claim 1, it is characterized in that: step (7) described phosphorating treatment is specially, bolt after Passivation Treatment is put into 55 DEG C of etching solutions and soak 4min, carry out again cleaning, air-dry, get product bolt, and wherein the weight portion of each constituent of etching solution is: 75 parts of polyethylene glycol, 32 parts of Mazhev salts, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN107059022A (en) * | 2017-05-04 | 2017-08-18 | 广州科锐模具设备有限公司 | A kind of processing method of steel |
| CN107252875A (en) * | 2017-06-23 | 2017-10-17 | 扬中市第蝶阀厂有限公司 | A kind of manufacture method of high intensity valve body |
| CN107378392A (en) * | 2017-07-10 | 2017-11-24 | 安徽长江紧固件有限责任公司 | A kind of high-strength bolt processing technology |
| CN108070851A (en) * | 2017-11-30 | 2018-05-25 | 重庆徐丁科技有限公司 | A kind of motorcycle bottom fork surface anti-corrosive technology |
| CN108145385A (en) * | 2017-12-27 | 2018-06-12 | 鞍钢重型机械有限责任公司 | A kind of manufacturing method of high-intensity and high-tenacity bolt |
| CN109372869A (en) * | 2018-09-30 | 2019-02-22 | 江苏永昊高强度螺栓有限公司 | A kind of high-strength bolt and its manufacturing method |
| CN110052788A (en) * | 2019-04-30 | 2019-07-26 | 海盐猛凌汽车配件有限公司 | A kind of contact bolt processing technic featuring |
| CN111590272A (en) * | 2020-05-15 | 2020-08-28 | 江苏永昊高强度螺栓有限公司 | Bolt machining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107059022A (en) * | 2017-05-04 | 2017-08-18 | 广州科锐模具设备有限公司 | A kind of processing method of steel |
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| CN109372869A (en) * | 2018-09-30 | 2019-02-22 | 江苏永昊高强度螺栓有限公司 | A kind of high-strength bolt and its manufacturing method |
| CN110052788A (en) * | 2019-04-30 | 2019-07-26 | 海盐猛凌汽车配件有限公司 | A kind of contact bolt processing technic featuring |
| CN111590272A (en) * | 2020-05-15 | 2020-08-28 | 江苏永昊高强度螺栓有限公司 | Bolt machining method |
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Application publication date: 20151216 |