CN109352278A - A kind of high strength steel rack bolt processing technology - Google Patents
A kind of high strength steel rack bolt processing technology Download PDFInfo
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- CN109352278A CN109352278A CN201811323591.0A CN201811323591A CN109352278A CN 109352278 A CN109352278 A CN 109352278A CN 201811323591 A CN201811323591 A CN 201811323591A CN 109352278 A CN109352278 A CN 109352278A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000641 cold extrusion Methods 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 238000005242 forging Methods 0.000 claims abstract description 11
- 239000002075 main ingredient Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 20
- 238000002791 soaking Methods 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 14
- 230000000171 quenching effect Effects 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000004080 punching Methods 0.000 claims description 10
- 125000003003 spiro group Chemical group 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 5
- 229910002651 NO3 Inorganic materials 0.000 claims description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 5
- 239000010721 machine oil Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052961 molybdenite Inorganic materials 0.000 claims description 5
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 5
- 230000009972 noncorrosive effect Effects 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 238000005262 decarbonization Methods 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
- 125000004430 oxygen atom Chemical group O* 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- 229910052702 rhenium Inorganic materials 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000007514 turning 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
Abstract
A kind of high strength steel rack bolt processing technology, the main ingredient of node bolt are Ni, Mo, Cr, S, P, Mn, Si, C, Re, Fe, and bolt is made by techniques such as high frequency induction current hot forging, cold extrusions in the processing technology of the bolt.The present invention is on the basis of number of patent application is 200810020089.2 patent application, it, which is hot-forged, uses high-frequency induction heating, its frequency is controlled at ten thousand hertz of 2-5, the advantages that, homogeneous heating fast using high-frequency induction heating speed, workpiece surface acquisition center portion can be made uniformly to organize to surface, performance, the being heated evenly property of workpiece is improved, better crystal phase structure can be obtained, obtain the high-strength bolt of more preferable performance；A large amount of carbon rich material matter is put into softening furnace in soft annealing step simultaneously, carbon rich material matter captures oxygen atom in furnace at high temperature, reduces furnace internal oxidition atmosphere, reduces the degree of workpiece oxidation and decarbonization, further ensures the quality of workpiece.
Description
Technical field
The invention belongs to steel mesh frame connector processing technique fields, and in particular to a kind of high strength steel rack bolt processing work
Skill.
Background technique
Node is an important feature component in steel frame construction, it plays connection crossing rod piece, transmits rod piece internal force
Effect, while being also the point that rack and roofing, ceiling, pipeline, suspension equipment etc. are connect, it plays transmitting and support hangs the work of load
With therefore, the structure of node makes the stress performance of entire rack, fabrication and installation, project progress, steel using amount index and engineering
Valence all has a direct impact.
Currently, the processing method of ball node bolt generally uses turning mode to be formed, intensity is often difficult to protect
Card, when tensile strength is more than certain value, in the place that notch is concentrated, such as bar and the transition position or thread root on head are easy to make
At delayed fracture and fatigue fracture, construction quality is caused to seriously affect, can be led due to the inadequate of its bonding strength when serious
The generation of safety accident is caused, therefore needs that the production technology of traditional high-strength bolt is studied and improved, to ensure it
It can efficiently be produced in enormous quantities under the premise of quality, meet society to the extensive need of Elements of Space Grid Truss ball node high-strength bolt
It wants.
Number of patent application provides a kind of high-intensitive big turret head of steel construction for 200810020089.2 patent application
The processing technology of bolt, main inventive point are to use less to process using cold extrusion, without Cutting Process to improve workpiece
Axial surface or internal fiber tissue, while being tempered in heat treatment using salt bath quenching and salt made from earth containing a comparatively high percentage of sodium chloride, reduce workpiece surface oxidation
The degree of decarburized layer further ensures the quality of bolt, but emits in first step in hot forging, is heated, is existed with hot forging furnace
Heating speed is slow, heating is uneven, causes the certain position overheats of workpiece, some underheated defects in place, be easy to cause
The defects such as bark pocket occurs for workpiece, slag inclusion, folder split, crack；Simultaneously in softening a step, since softening furnace internal oxidition atmosphere is tight
Weight, workpiece oxidation and decarbonization layer phenomenon is serious, also affects the quality of workpiece.
Summary of the invention
The purpose of the present invention is to provide a kind of high strength steel rack bolt processing technology, the processing technology is simple and energy
Produce the Elements of Space Grid Truss ball node bolt of high quality.
To achieve the above object, the present invention provides a kind of high strength steel rack bolt processing technology, the node bolt
Main ingredient by weight percentage, Ni≤0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.20~
1.90, Si 0.30~0.50, C 0.07~0.20, Re 0.22~0.30, surplus Fe, specific procedure of processing by below into
Row:
(1) it stocks up: preparing blank by above-mentioned group of ingredient components, and according to blank under the big trolley of the specification of bolt；
(2) hot forging is begun to crop up: it is begun to crop up and is hot-forged to bolt with 800~1000 DEG C of temperature in high frequency induction heater,
The frequency of high frequency induction current is 2~50,000 hertz, rear cooling；
(3) soft annealing: carrying out isothermal spheroidizing in bell-type furnace, and a large amount of carbon rich material matter is put into bell-type furnace, soft
Annealing temperature takes 760 ± 15 DEG C, and soaking time is 7~11h, and furnace cooling is come out of the stove to 250 DEG C or less after heat preservation, hardness control
System is between HB100~120；
(4) blank surface processing and lubrication: phosphorating treatment is carried out to spiro rod section and applies MoS2Process of surface treatment, work
Skill process are as follows: apply MoS on alkali cleaning → washing → pickling → washing → phosphatization → cleaning → oscillator2；
(5) cold extrusion shaped for the first time: spiro rod section being squeezed at room temperature, selects 150~200 tons of gas position punching machines；
(6) second of extrusion forming: at room temperature squeezing thread segment on screw rod, selects 70~90 tons of gas position punchings
Bed；
(7) third time extrusion forming carries out thread forming at room temperature, selects Z-28 screw-rolling machine；
(8) quench: molded part being quenched in salt bath furnace, temperature control at 860 ± 10 DEG C, the heating-up time 3~
6min, 20~40min of soaking time, after the completion of quenching, cooling with oil, cooling temperature is less than 80 DEG C；
(9) it examines: being tested with HR-150A Rockwell Hardness meter to it, being not less than 50 with HRC is pieces O.K.；
(10) it is tempered: pieces O.K. being tempered in nitrate furnace, temperature control is in 530 ± 15 DEG C, heating-up time
20~30min, soaking time are 50~70min, after the completion of tempering, are cooled down at room temperature with water；
(11) secondary check: testing to it with HR-150A Rockwell Hardness meter, with HRC for pieces O.K. in 32~37；
(12) hair is blue: Bluing treatment is carried out to above-mentioned pieces O.K., to ensure its non-corrosive；
(13) it is put in storage.
Preferably, hot forging temperature is 900 DEG C in the step (2), and the frequency of high frequency induction current is 30,000 hertz.
Preferably, in the step (3) carbon rich material matter be one of waste diesel, machine oil, gloves, cotton yarn, loose thread or its
In several mixtures.
Preferably, hardening heat is controlled at 860 DEG C, heating-up time 5min, soaking time 30min in the step (8).
Preferably, at 530 DEG C, heating-up time 25min, soaking time is for tempering temperature control in the step (10)
60min。
Preferably, the main ingredient of the node bolt by weight percentage, Ni≤0.02, Mo≤0.14, Cr≤
0.28, S≤0.014, P≤0.016, Mn 1.50, Si 0.40, C 0.12, Re 0.28, surplus Fe.
For the present invention on the basis of number of patent application is 200810020089.2 patent application, hot forging uses high frequency
The advantages that induction heating, frequency are controlled at ten thousand hertz of 2-5, homogeneous heating fast using high-frequency induction heating speed, can make workpiece
Surface obtain center portion uniformly organized to surface, performance, improve the being heated evenly property of workpiece, better crystal phase knot can be obtained
Structure obtains the high-strength bolt of more preferable performance；A large amount of carbon rich material matter is put into softening furnace in soft annealing step simultaneously,
Carbon rich material matter captures oxygen atom in furnace under high temperature, reduces furnace internal oxidition atmosphere, reduces the degree of workpiece oxidation and decarbonization, further really
The quality of workpiece is protected.
The mechanism of other each steps of the invention is as follows:
Since the hardness at each position of bolt under hot-rolled state is uneven, plasticity is poor, and resistance of deformation is big, if not softened move back
Fire handles and directly carries out cold extrusion processing, then forming difficulty, mold are easily damaged, extrusion is easy to produce crackle, therefore
It needs to carry out soft annealing processing to blank before cold-extrusion shaping.The present invention using spheroidizing make it have lower hardness and compared with
Good plasticity, in order to further increase the mechanical performance of material, normalizing process is can also be used to material softening in the present invention.
In order to reduce the residual stress of material and improve the surface quality of material, the present invention is wanted before to material cold extrusion
Processing, mainly phosphorating treatment are lubricated to material, the fatigue behaviour of material can be significantly reduced by carrying out phosphorating treatment through research,
Also it is more conducive to carry out cold extrusion processing to it.
The present invention carry out it is cold extrusion shaped three times, substantially increase each section of bolt intensity its, bolt is high-quality, precision
High, its strength character might as well；Cold extrusion belongs to less, without machining, saves raw material；Cold extrusion is shaped using mold
, it is highly efficient in productivity；Stock utilization greatly improves according to statistics, reaches 99.5%~99.7%, processing efficiency about passes
1.8 times of system Cutting Process, unit cost is greatly lowered, because it belongs to less without cutting technology, so that the material of bolt is fine
Dimension direction embodies globality on bolt body, substantially increases its tensile strength.
Heat treatment of the invention uses modifier treatment, i.e. quenching is good comprehensive to obtain having plus the processing being tempered
The Ya Wen of high temperature quenching, high frequency circulation rapid heating and quenching and sub-eutectoid steel can be used in the bolt of energy, process for quenching of the invention
The modern quenching mode such as quenching, makes bolt of the invention have better mechanical property.
Specific embodiment
Invention is further described in detail with reference to embodiments.
Embodiment 1
A kind of high strength steel rack bolt processing technology, the main ingredient of the node bolt by weight percentage, Ni
≤ 0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.20, Si 0.30, C 0.07, Re 0.22, it is remaining
Amount is Fe, and specific procedure of processing is carried out as follows:
(1) it stocks up: preparing blank by above-mentioned group of ingredient components, and according to blank under the big trolley of the specification of bolt；
(2) hot forging is begun to crop up: it is begun to crop up and is hot-forged to bolt with 800 DEG C of temperature in high frequency induction heater, high frequency sense
The frequency for answering electric current is 20,000 hertz, rear cooling；
(3) soft annealing: carrying out isothermal spheroidizing in bell-type furnace, and a large amount of carbon rich material matter, institute are put into bell-type furnace
State carbon rich material matter be one of waste diesel, machine oil, gloves, cotton yarn, loose thread or in which several mixtures；Softening annealing temperature
Take 745 DEG C, soaking time 11h, furnace cooling is come out of the stove to 250 DEG C or less after heat preservation, hardness control HB100~120 it
Between；
(4) blank surface processing and lubrication: phosphorating treatment is carried out to spiro rod section and applies MoS2Process of surface treatment, work
Skill process are as follows: apply MoS on alkali cleaning → washing → pickling → washing → phosphatization → cleaning → oscillator2；
(5) cold extrusion shaped for the first time: spiro rod section being squeezed at room temperature, selects 150~200 tons of gas position punching machines；
(6) second of extrusion forming: at room temperature squeezing thread segment on screw rod, selects 70~90 tons of gas position punchings
Bed；
(7) third time extrusion forming carries out thread forming at room temperature, selects Z-28 screw-rolling machine；
(8) it quenches: molded part being quenched in salt bath furnace, temperature is controlled at 850 DEG C, heating-up time 6min, is protected
Warm time 40min, after the completion of quenching, cooling with oil, cooling temperature is less than 80 DEG C；
(9) it examines: being tested with HR-150A Rockwell Hardness meter to it, being not less than 50 with HRC is pieces O.K.；
(10) it is tempered: pieces O.K. being tempered in nitrate furnace, temperature control is in 515 DEG C, heating-up time
30min, soaking time 70min after the completion of tempering, are cooled down at room temperature with water；
(11) secondary check: testing to it with HR-150A Rockwell Hardness meter, with HRC for pieces O.K. in 32~37；
(12) hair is blue: Bluing treatment is carried out to above-mentioned pieces O.K., to ensure its non-corrosive；
(13) it is put in storage.
Embodiment two
A kind of high strength steel rack bolt processing technology, the main ingredient of the node bolt by weight percentage, Ni
≤ 0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.50, Si 0.40, C 0.12, Re 0.28, it is remaining
Amount is Fe, and specific procedure of processing is carried out as follows:
(1) it stocks up: preparing blank by above-mentioned group of ingredient components, and according to blank under the big trolley of the specification of bolt；
(2) hot forging is begun to crop up: it is begun to crop up and is hot-forged to bolt with 900 DEG C of temperature in high frequency induction heater, high frequency sense
The frequency for answering electric current is 40,000 hertz, rear cooling；
(3) soft annealing: carrying out isothermal spheroidizing in bell-type furnace, and a large amount of carbon rich material matter, institute are put into bell-type furnace
State carbon rich material matter be one of waste diesel, machine oil, gloves, cotton yarn, loose thread or in which several mixtures；Softening annealing temperature
Take 760 DEG C, soaking time 9h, furnace cooling is come out of the stove to 250 DEG C or less after heat preservation, hardness control HB100~120 it
Between；
(4) blank surface processing and lubrication: phosphorating treatment is carried out to spiro rod section and applies MoS2Process of surface treatment, work
Skill process are as follows: apply MoS on alkali cleaning → washing → pickling → washing → phosphatization → cleaning → oscillator2；
(5) cold extrusion shaped for the first time: spiro rod section being squeezed at room temperature, selects 150~200 tons of gas position punching machines；
(6) second of extrusion forming: at room temperature squeezing thread segment on screw rod, selects 70~90 tons of gas position punchings
Bed；
(7) third time extrusion forming carries out thread forming at room temperature, selects Z-28 screw-rolling machine；
(8) it quenches: molded part being quenched in salt bath furnace, temperature is controlled at 860 DEG C, heating-up time 4min, is protected
Warm time 30min, after the completion of quenching, cooling with oil, cooling temperature is less than 80 DEG C；
(9) it examines: being tested with HR-150A Rockwell Hardness meter to it, being not less than 50 with HRC is pieces O.K.；
(10) it is tempered: pieces O.K. being tempered in nitrate furnace, temperature control is in 530 DEG C, heating-up time
25min, soaking time 60min after the completion of tempering, are cooled down at room temperature with water；
(11) secondary check: testing to it with HR-150A Rockwell Hardness meter, with HRC for pieces O.K. in 32~37；
(12) hair is blue: Bluing treatment is carried out to above-mentioned pieces O.K., to ensure its non-corrosive；
(13) it is put in storage.
Embodiment three
A kind of high strength steel rack bolt processing technology, the main ingredient of the node bolt by weight percentage, Ni
≤ 0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.90, Si 0.50, C 0.20, Re 0.30, it is remaining
Amount is Fe, and specific procedure of processing is carried out as follows:
(1) it stocks up: preparing blank by above-mentioned group of ingredient components, and according to blank under the big trolley of the specification of bolt；
(2) hot forging is begun to crop up: it is begun to crop up and is hot-forged to bolt with 1000 DEG C of temperature in high frequency induction heater, high frequency sense
The frequency for answering electric current is 50,000 hertz, rear cooling；
(3) soft annealing: carrying out isothermal spheroidizing in bell-type furnace, and a large amount of carbon rich material matter, institute are put into bell-type furnace
State carbon rich material matter in step (3) be one of waste diesel, machine oil, gloves, cotton yarn, loose thread or in which several mixtures, it is soft
Annealing temperature takes 775 DEG C, and soaking time 7h, furnace cooling is come out of the stove to 250 DEG C or less after heat preservation, and hardness control exists
Between HB100~120；
(4) blank surface processing and lubrication: phosphorating treatment is carried out to spiro rod section and applies MoS2Process of surface treatment, work
Skill process are as follows: apply MoS on alkali cleaning → washing → pickling → washing → phosphatization → cleaning → oscillator2；
(5) cold extrusion shaped for the first time: spiro rod section being squeezed at room temperature, selects 150~200 tons of gas position punching machines；
(6) second of extrusion forming: at room temperature squeezing thread segment on screw rod, selects 70~90 tons of gas position punchings
Bed；
(7) third time extrusion forming carries out thread forming at room temperature, selects Z-28 screw-rolling machine；
(8) it quenches: molded part being quenched in salt bath furnace, temperature is controlled at 870 DEG C, heating-up time 3min, is protected
Warm time 20min, after the completion of quenching, cooling with oil, cooling temperature is less than 80 DEG C；
(9) it examines: being tested with HR-150A Rockwell Hardness meter to it, being not less than 50 with HRC is pieces O.K.；
(10) it is tempered: pieces O.K. being tempered in nitrate furnace, temperature control is in 545 DEG C, heating-up time
20min, soaking time 50min after the completion of tempering, are cooled down at room temperature with water；
(11) secondary check: testing to it with HR-150A Rockwell Hardness meter, with HRC for pieces O.K. in 32~37；
(12) hair is blue: Bluing treatment is carried out to above-mentioned pieces O.K., to ensure its non-corrosive；
(13) it is put in storage.
Claims (6)
1. a kind of high strength steel rack bolt processing technology, the main ingredient of the node bolt by weight percentage, Ni≤
0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.20~1.90, Si 0.30~0.50, C 0.07~
0.20,0.22~0.30 Re, surplus Fe, which is characterized in that specific procedure of processing is carried out as follows:
(1) it stocks up: preparing blank by above-mentioned group of ingredient components, and according to blank under the big trolley of the specification of bolt；
(2) hot forging is begun to crop up: it is begun to crop up and is hot-forged to bolt with 800~1000 DEG C of temperature in high frequency induction heater, high frequency
Faradic frequency is 2~50,000 hertz, rear cooling；
(3) soft annealing: carrying out isothermal spheroidizing in bell-type furnace, and a large amount of carbon rich material matter is put into bell-type furnace, and softening is moved back
Fiery temperature takes 760 ± 15 DEG C, and soaking time is 7~11h, and furnace cooling is come out of the stove to 250 DEG C or less after heat preservation, and hardness control exists
Between HB100~120；
(4) blank surface processing and lubrication: phosphorating treatment is carried out to spiro rod section and applies MoS2Process of surface treatment, technique stream
Journey are as follows: apply MoS on alkali cleaning → washing → pickling → washing → phosphatization → cleaning → oscillator2；
(5) cold extrusion shaped for the first time: spiro rod section being squeezed at room temperature, selects 150~200 tons of gas position punching machines；
(6) second of extrusion forming: at room temperature squeezing thread segment on screw rod, selects 70~90 tons of gas position punching machines；
(7) third time extrusion forming carries out thread forming at room temperature, selects Z-28 screw-rolling machine；
(8) it quenching: molded part being quenched in salt bath furnace, temperature is controlled at 860 ± 10 DEG C, 3~6min of heating-up time,
20~40min of soaking time, after the completion of quenching, cooling with oil, cooling temperature is less than 80 DEG C；
(9) it examines: being tested with HR-150A Rockwell Hardness meter to it, being not less than 50 with HRC is pieces O.K.；
(10) be tempered: pieces O.K. being tempered in nitrate furnace, temperature control at 530 ± 15 DEG C, the heating-up time is 20~
30min, soaking time are 50~70min, after the completion of tempering, are cooled down at room temperature with water；
(11) secondary check: testing to it with HR-150A Rockwell Hardness meter, with HRC for pieces O.K. in 32~37；
(12) hair is blue: Bluing treatment is carried out to above-mentioned pieces O.K., to ensure its non-corrosive；
(13) it is put in storage.
2. a kind of high strength steel rack bolt processing technology according to claim 1, it is characterised in that: the step (2)
Middle hot forging temperature is 900 DEG C, and the frequency of high frequency induction current is 30,000 hertz.
3. a kind of high strength steel rack bolt processing technology according to claim 1 or 2, it is characterised in that: the step
(3) in carbon rich material matter be one of waste diesel, machine oil, gloves, cotton yarn, loose thread or in which several mixtures.
4. a kind of high strength steel rack bolt processing technology according to claim 1 or 2, it is characterised in that: the step
(8) hardening heat control is at 860 DEG C, heating-up time 5min, soaking time 30min in.
5. a kind of high strength steel rack bolt processing technology according to claim 1 or 2, it is characterised in that: the step
(10) tempering temperature control is at 530 DEG C, heating-up time 25min, soaking time 60min in.
6. a kind of high strength steel rack bolt processing technology according to claim 1 or 2, it is characterised in that: the node
By weight percentage with the main ingredient of bolt, Ni≤0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016,
Mn 1.50, Si 0.40, C 0.12, Re 0.28, surplus Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811323591.0A CN109352278A (en) | 2018-11-08 | 2018-11-08 | A kind of high strength steel rack bolt processing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811323591.0A CN109352278A (en) | 2018-11-08 | 2018-11-08 | A kind of high strength steel rack bolt processing technology |
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| CN109352278A true CN109352278A (en) | 2019-02-19 |
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ID=65344600
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110695627A (en) * | 2019-10-31 | 2020-01-17 | 李秋文 | Hot heading processing technology for fastener |
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2018
- 2018-11-08 CN CN201811323591.0A patent/CN109352278A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110695627A (en) * | 2019-10-31 | 2020-01-17 | 李秋文 | Hot heading processing technology for fastener |
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Application publication date: 20190219 |