CN105112789B - Hinge pin and machining method thereof - Google Patents
Hinge pin and machining method thereof Download PDFInfo
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Abstract
The invention relates to a hinge pin and a machining method thereof and belongs to the technical field of machining of hinge pins. The hinge pin is prepared from high-strength alloy steel. The alloy steel is composed of, by mass, 0.20%-0.50% of C, 2.50%-2.80% of Cr, 0.30%-0.80% of Mo, 0.30%-0.60% of B, 0.40%-0.60% of Ti, 0.02%-0.20% of Al, 0-0.10% of Si, 0-0.030% of S, 0-0.030% of P and the balance Fe. The reasonable-compatibility alloy steel for the hinge pin is subjected to spheroidizing annealing, phosphating and other treatment firstly, and then is machined to form a semi-finished hinge pin, and the hinge pin is obtained through the specific carburizing heat treatment and black dacromet treatment, so that the hinge pin meets the requirements of high-strength hinge pin steel in strength and hardness, for example, the hardness reaches 25 HRC, the surface hardness reaches 31 HRC, and the corrosion resistance of the hinge pin is further improved greatly.
Description
Technical field
The present invention relates to a kind of bearing pin and its processing method, belong to bearing pin processing technique field.
Background technology
Pin shaft connection structure is the most frequently used a kind of force transferring structure in engineering, such as, to meet the need for split transports, greatly
Connected using bearing pin between the arm and turntable, pole and turntable of tonnage caterpiller crane.It is larger for carrying higher/size
Structure member between bearing pin connection for, the physical dimension of its bearing pin is larger and stress is also larger, and bearing pin exposure outside,
Easily scraped by external force, touched, therefore, required dismounting space and dismounting power is all larger.And bearing pin of the prior art is present very
Many drawbacks, such as sell directly to households or taper pin size are restricted, it is adaptable between two little parts of stress；Sell the essence reamed with taper pin directly to households
Degree influence is big；Sell directly to households and the taper pin bad control of precision after a single use, recycling rate of waterused is low；The material of numerous bearing pins be all with
Ordinary steel is made, and all need to be improved in intensity, wearability, precision.
The content of the invention
Defect of the present invention existing for prior art, there is provided a kind of intensity, hardness are higher, and wearability, precision are preferable
Bearing pin.
Above-mentioned purpose of the invention can be carried out by the following technical programs：A kind of bearing pin, the bearing pin is by high-strength
The steel alloy of degree is made, and described steel alloy is made up of the chemical composition of following mass percent：C：0.20%-0.50%, Cr：
2.50-2.80%, Mo：0.30%-0.80%, B：0.30-0.60%, Ti：0.40-0.60%, Al：0.02%-0.20%, Si
≤ 0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
The chemical composition of existing common bearing pin steel 42CrMo is C：0.38-0.45%；Mn：0.50-0.80%；Cr：
0.80-1.20%；Mo：0.15-0.25%；Si：0.17-0.37%；S≤0.0035%；P≤0.0035%；Ni≤
0.030%；Cu≤0.030%；Remaining is Fe.First, the present invention drops on the basis of common high-strength pin steel 42CrMo
Low carbon (C), and the chromium of high level is added, while with the addition of boron (B), titanium (Ti), aluminium (Al) to make up because of carbon drop, omit manganese
(Mn) loss of the intensity and quenching degree that cause, further improves the quenching degree of bearing pin steel alloy, and then improve bearing pin steel alloy
Hardness and intensity.Secondly, although silicon (Si) has slight invigoration effect, the toughness of steel also can slightly be improved, in steel alloy
Molybdenum one when working, effect more preferably, but the silicon of excess can have a strong impact on the welding performance of steel, therefore, bearing pin steel of the present invention
The appropriate content for reducing silicon, the content of silicon is controlled within 0.10%.Furthermore, bearing pin steel of the present invention is on the basis of 42CrMo
On not only eliminate Cu in Mn and impurity, boron (B), titanium (Ti), aluminium (Al) are also additionally with the addition of, to crystal grain thinning, warp
Constantly experiment finds that the synergy that boron (B), titanium (Ti), three kinds of elements of aluminium (Al) are produced when adding together can be further big
Amplitude improves impact flexibility, intensity and the wearability of bearing pin steel alloy.Finally, bearing pin steel alloy of the present invention is by reducing S contents
And then reduce bearing pin steel alloy in non-metallic inclusion, improve steel toughness plasticity, improve bearing pin steel alloy decay resistance and
Intensity, by reducing P content and then reducing the resistance of deformation of bearing pin steel, while reduce P, S mitigates crystalline substance in the segregation of crystal boundary
Boundary is brittle.Due to the change of chemical composition, its microscopic structure also changes, and bearing pin of the invention is not only in intensity and hardness
The due requirement of high-strength pin steel can be reached, the corrosion resistance of bearing pin is also significantly improved.
In above-mentioned bearing pin, preferably, the bearing pin is made up of the steel alloy of high intensity, described steel alloy by with
The chemical composition composition of lower mass percent：C：0.25%-0.35%, Cr：2.60-2.80%, Mo：0.40%-0.60%, B：
0.35-0.55%, Ti：0.45-0.50%, Al：0.08%-0.15%, Si≤0.10%, S≤0.030%, P≤0.030%,
Remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.30%, Cr：
2.70%, Mo：0.50%, B：0.45%, Ti：0.48%, Al：0.12%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.32%, Cr：
2.66%, Mo：0.55%, B：0.42%, Ti：0.46%, Al：0.10%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.25%, Cr：
2.80%, Mo：0.40%, B：0.55%, Ti：0.45%, Al：0.15%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.35%, Cr：
2.60%, Mo：0.60%, B：0.35%, Ti：0.50%, Al：0.08%%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
It is another object of the present invention to provide a kind of processing method of above-mentioned bearing pin, the processing method includes as follows
Step：
S1, pre-treatment：Steel alloy used by the bearing pin of chemical composition as described above is first carried out into acid pickling and rust removing, is air-dried, then
Raw material after air-drying carries out spheroidizing treatment at 760-780 DEG C, and phosphorating treatment and drawing are carried out after samming treatment 5h-8h
Silk；
S2, shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and successively
Carry out turning, groove milling, thread rolling and obtain bearing pin semi-finished product；
S3, heat treatment：Bearing pin semi-finished product are incubated 40-80min at 520-540 DEG C, 860-900 DEG C of insulation 40- is warming up to
80min, fast cooling is heated to 860-900 DEG C and is incubated 40-80min to 520-550 DEG C of insulation 70-100min, then naturally cold
But to room temperature；
S4, surface treatment：After by bearing pin semi-finished product cleaning oil removing, the ball blast after heat treatment, in black Dacroment masking liquid
Dip-coating or spraying, then through 110-125 DEG C of baking 8-15min, then solidify 25-35min at 340-350 DEG C, it is obtained with black
The bearing pin finished product of color Dacromet/steel.
Steel alloy used by bearing pin is first carried out pre-treatment by the processing method of bearing pin of the present invention, including spheroidizing treatment,
Phosphorating treatment etc., the type of being subsequently processed into obtains bearing pin, and the hardness for further improving bearing pin is heat-treated by carburizing, makes case depth
0.2-0.4mm is reached, black water organic coating is formed on bearing pin surface finally by self start type black the dacroment process, make it
Film layer has extremely strong adhesive force, lubricity, delustring, heat resistance, a corrosion resistance, and then significantly improves the case hardness of bearing pin, strong
Degree, corrosion resistance.
The performance perfect in order to ensure coating, increases clear top coat layer in black primary coat, constitute complete black up to gram
Sieve coating system.Confining bed is that, using silicate water paint, equipment is identical with Dacroment equipment, and solidification temperature is identical, solidification
Time is 4-8min.The coating is coated in black Dacromet/steel surface as surface layer, can improve the corrosion resistant of black Dacroment
Erosion ability and case hardness.That is step S4 is surface-treated also includes Seal treatment after the solidification of black the dacroment process, closing
Treatment is carried out in silicate water paint, and the solidification temperature of Seal treatment is 340-350 DEG C, and hardening time is 4-8min.
Preferably, in the processing method of above-mentioned bearing pin, the black Dacroment masking liquid described in step S4 surface treatments
(counted by weight) including following component：50 parts of epoxy resin；20-40 parts of black pigment；50-60 parts of zinc powder；0.1-0.5 parts
Dispersant；0.5-3 parts of alcoholic solvent；2-10 parts of chromic acid solution；40-100 parts of organic solvent.
Black dacromet paint of the prior art typically contains aluminium powder, and the Dacromet/steel appearance color containing aluminium powder is white
It is bright, when adding black pigment, increase the difficulty of black mask, to make coating must be added to more pigment in black, so as to increase
Plus dispersed difficulty, and large effect coating performance.Aluminium powder is free of in black dacromet paint of the present invention, piece is only added
Shape zinc powder, reduces whiteness and the brightness of coating, reduces the difficulty of black mask, improves blackness.
Further preferably, the black pigment described in black Dacroment masking liquid be graphite, activated carbon, carbon black in one kind or
It is various.
Further preferably, the dispersant described in black Dacroment masking liquid is Dodecyl Polyoxyethylene Ether, tetradecyl alchohol polyoxy
One or more in vinethene, hexadecanol APEO.
Further preferably, the organic solvent described in black Dacroment masking liquid is the one kind or many in benzene,toluene,xylene
Kind.
Further preferably, the alcoholic solvent described in black Dacroment masking liquid be propyl alcohol, isopropanol, n-butanol in one kind or
It is various.
In sum, the present invention reduces carbon (C) and silicon (Si) on the basis of common high strength alloy steel 42CrMo
Content, not only eliminates the Cu in Mn and impurity, also additionally with the addition of boron (B), titanium (Ti), aluminium (Al), to crystal grain thinning,
Found through constantly experiment, the synergy that boron (B), titanium (Ti), three kinds of elements of aluminium (Al) are produced when adding together, and it is further excellent
The content of other chemical compositions is changed, due to the change of chemical composition, its microscopic structure also changes.And use above-mentioned compatibility
Steel alloy used by rational bearing pin first passes through the treatment such as spheroidizing, phosphatization, and reprocessing is molded to obtain bearing pin semi-finished product, Ran Houjing
Cross specific carburizing heat treatment and black the dacroment process be obtained bearing pin of the invention, make bearing pin of the invention not only in intensity and
The due requirement of high-strength pin steel can be reached in hardness, such as hardness reaches 25HRC, and case hardness reaches 31HRC, also greatly carries
The high corrosion resistance for improving bearing pin.
Specific embodiment
The following is specific embodiment of the invention, technical scheme is further described, but the present invention is simultaneously
It is not limited to these embodiments.
A kind of bearing pin, the bearing pin is made up of the steel alloy of high intensity, and described steel alloy is by following mass percent
Chemical composition is constituted：C：0.20%-0.50%, Cr：2.50-2.80%, Mo：0.30%-0.80%, B：0.30-0.60%,
Ti：0.40-0.60%, Al：0.02%-0.20%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Preferably, the bearing pin is made up of the steel alloy of high intensity, described steel alloy is by following mass percent
Chemical composition is constituted：C：0.25%-0.35%, Cr：2.60-2.80%, Mo：0.40%-0.60%, B：0.35-0.55%,
Ti：0.45-0.50%, Al：0.08%-0.15%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.30%, Cr：
2.70%, Mo：0.50%, B：0.45%, Ti：0.48%, Al：0.12%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.32%, Cr：
2.66%, Mo：0.55%, B：0.42%, Ti：0.46%, Al：0.10%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.25%, Cr：
2.80%, Mo：0.40%, B：0.55%, Ti：0.45%, Al：0.15%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.35%, Cr：
2.60%, Mo：0.60%, B：0.35%, Ti：0.50%, Al：0.08%%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe.
The processing method of above-mentioned bearing pin comprises the following steps：
S1, pre-treatment：Steel alloy used by the bearing pin of above-mentioned chemical composition is first carried out into acid pickling and rust removing, is air-dried, then by wind
Raw material after dry carries out spheroidizing treatment at 760-780 DEG C, and phosphorating treatment and wire drawing are carried out after samming treatment 5h-8h；
S2, shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and successively
Carry out turning, groove milling, thread rolling and obtain bearing pin semi-finished product；
S3, heat treatment：Bearing pin semi-finished product are incubated 40-80min at 520-540 DEG C, 860-900 DEG C of insulation 40- is warming up to
80min, fast cooling is heated to 860-900 DEG C and is incubated 40-80min to 520-550 DEG C of insulation 70-100min, then naturally cold
But to room temperature, case depth is made to reach 0.2-0.4mm；
S4, surface treatment：Bearing pin semi-finished product after heat treatment are first cleaned into oil removing, ball blast, then in black Dacroment masking liquid
Middle dip-coating or spraying, then through 110-125 DEG C of baking 8-15min, then solidify 25-35min at 340-350 DEG C, and tool is obtained
There is the bearing pin finished product of black Dacromet/steel.
Preferably, step S4 surface treatments also include Seal treatment after the solidification of black the dacroment process, at closing
Reason is carried out in silicate water paint, and the solidification temperature of Seal treatment is 340-350 DEG C, and hardening time is 4-8min.
Preferably, the black Dacroment masking liquid described in step S4 surface treatments includes following component (by weight
Number)：50 parts of epoxy resin；20-40 parts of black pigment；50-60 parts of zinc powder；0.1-0.5 parts of dispersant；0.5-3 parts of alcoholic solvent；2-
10 parts of chromic acid solutions；40-100 parts of organic solvent.Further preferably, the black pigment described in black Dacroment masking liquid is stone
One or more in ink, activated carbon, carbon black.Further preferably, the dispersant described in black Dacroment masking liquid is lauryl alcohol
One or more in APEO, tetradecyl alchohol APEO, hexadecanol APEO.Further preferably, black reaches
Organic solvent described in the masking liquid of Crow is one or more in benzene,toluene,xylene.Further preferably, black Dacroment
Alcoholic solvent described in masking liquid is one or more in propyl alcohol, isopropanol, n-butanol.
Embodiment 1：A kind of bearing pin, processes as follows：
Pre-treatment：Steel alloy used by the bearing pin of chemical composition as described below is first carried out into acid pickling and rust removing, is air-dried, then by wind
Raw material after dry carries out spheroidizing treatment at 770 DEG C, and phosphorating treatment and wire drawing are carried out after samming treatment 6h；The bearing pin steel
Chemical composition be：C：0.30%, Cr：2.70%, Mo：0.50%, B：0.45%, Ti：0.48%, Al：0.12%, Si≤
0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and enter successively
Driving is cut, groove milling, thread rolling obtain bearing pin semi-finished product.
Heat treatment：Bearing pin semi-finished product are incubated 50min at 530 DEG C, 880 DEG C of insulation 50min are warming up to, fast cooling is extremely
530 DEG C of insulation 80min, are heated to 880 DEG C of insulation 60min, then naturally cool to room temperature, case depth is reached 0.3mm.
Surface treatment：Bearing pin semi-finished product after heat treatment are first cleaned into oil removing, ball blast, then is soaked in black Dacroment masking liquid
Apply or spray, then through 115 DEG C of baking 12min, 30min is then solidified at 345 DEG C, finally enter in silicate water paint
Row Seal treatment, the solidification temperature of Seal treatment is 345 DEG C, and hardening time is 5min, obtains bearing pin finished product.Wherein, the black
Dacroment masking liquid includes following component (counting by weight)：50 parts of epoxy resin；15 parts of graphite, 15 parts of activated carbons；55 parts of zinc
Powder；0.3 part of Dodecyl Polyoxyethylene Ether；2 parts of propanol solvents；6 parts of chromic acid solutions；60 parts of toluene solvants.
Embodiment 2：A kind of bearing pin, processes as follows：
Pre-treatment：Steel alloy used by the bearing pin of chemical composition as described below is first carried out into acid pickling and rust removing, is air-dried, then by wind
Raw material after dry carries out spheroidizing treatment at 765 DEG C, and phosphorating treatment and wire drawing are carried out after samming treatment 6h；The bearing pin steel
Chemical composition be：C：0.32%, Cr：2.66%, Mo：0.55%, B：0.42%, Ti：0.46%, Al：0.10%, Si≤
0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and enter successively
Driving is cut, groove milling, thread rolling obtain bearing pin semi-finished product.
Heat treatment：Bearing pin semi-finished product are incubated 60min at 525 DEG C, 870 DEG C of insulation 60min are warming up to, fast cooling is extremely
540 DEG C of insulation 90min, are heated to 870 DEG C of insulation 50min, then naturally cool to room temperature, case depth is reached 0.3mm.
Surface treatment：Bearing pin semi-finished product after heat treatment are first cleaned into oil removing, ball blast, then is soaked in black Dacroment masking liquid
Apply or spray, then through 120 DEG C of baking 10min, 32min is then solidified at 348 DEG C, finally enter in silicate water paint
Row Seal treatment, the solidification temperature of Seal treatment is 348 DEG C, and hardening time is 6min, obtains bearing pin finished product.Wherein, the black
Dacroment masking liquid includes following component (counting by weight)：50 parts of epoxy resin；35 parts of carbon blacks；53 parts of zinc powders；0.4 part 14
Alcohol APEO；1 part of isopropanol solvent；4 parts of chromic acid solutions；80 parts of benzene solvents.
Embodiment 3：A kind of bearing pin, processes as follows：
Pre-treatment：Steel alloy used by the bearing pin of chemical composition as described below is first carried out into acid pickling and rust removing, is air-dried, then by wind
Raw material after dry carries out spheroidizing treatment at 760 DEG C, and phosphorating treatment and wire drawing are carried out after samming treatment 6h；The bearing pin steel
Chemical composition be：C：0.25%, Cr：2.80%, Mo：0.40%, B：0.55%, Ti：0.45%, Al：0.15%, Si≤
0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and enter successively
Driving is cut, groove milling, thread rolling obtain bearing pin semi-finished product.
Heat treatment：Bearing pin semi-finished product are incubated 40min at 540 DEG C, 900 DEG C of insulation 40min are warming up to, fast cooling is extremely
550 DEG C of insulation 70min, are heated to 900 DEG C of insulation 40min, then naturally cool to room temperature, case depth is reached 0.4mm.
Surface treatment：Bearing pin semi-finished product after heat treatment are first cleaned into oil removing, ball blast, then is soaked in black Dacroment masking liquid
Apply or spray, then through 110 DEG C of baking 15min, 35min is then solidified at 340 DEG C, finally enter in silicate water paint
Row Seal treatment, the solidification temperature of Seal treatment is 340 DEG C, and hardening time is 8min, obtains bearing pin finished product.Wherein, the black
Dacroment masking liquid includes following component (counting by weight)：50 parts of epoxy resin；20 parts of activated carbons；60 parts of zinc powders；0.1 part ten
Six alcohol APEOs；3 parts of n-butanol solvents；2 parts of chromic acid solutions；100 parts of xylene solvents.
Embodiment 4：A kind of bearing pin, processes as follows：
Pre-treatment：Steel alloy used by the bearing pin of chemical composition as described below is first carried out into acid pickling and rust removing, is air-dried, then by wind
Raw material after dry carries out spheroidizing treatment at 780 DEG C, and phosphorating treatment and wire drawing are carried out after samming treatment 6h；The bearing pin steel
Chemical composition be：C：0.35%, Cr：2.60%, Mo：0.60%, B：0.35%, Ti：0.50%, Al：0.08%%, Si≤
0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and enter successively
Driving is cut, groove milling, thread rolling obtain bearing pin semi-finished product.
Heat treatment：Bearing pin semi-finished product are incubated 80min at 520 DEG C, 860 DEG C of insulation 80min are warming up to, fast cooling is extremely
520 DEG C of insulation 100min, are heated to 860 DEG C of insulation 80min, then naturally cool to room temperature, case depth is reached 0.2mm.
Surface treatment：Bearing pin semi-finished product after heat treatment are first cleaned into oil removing, ball blast, then is soaked in black Dacroment masking liquid
Apply or spray, then through 125 DEG C of baking 8min, 25min is then solidified at 350 DEG C, finally enter in silicate water paint
Row Seal treatment, the solidification temperature of Seal treatment is 350 DEG C, and hardening time is 4min, obtains bearing pin finished product.Wherein, the black
Dacroment masking liquid includes following component (counting by weight)：50 parts of epoxy resin；15 parts of graphite, 25 parts of carbon blacks；50 parts of zinc powders；
0.5 part of Dodecyl Polyoxyethylene Ether；0.5 part of isopropanol solvent；8 parts of chromic acid solutions；50 parts of benzene solvents, 20 parts of toluene solvants.
Tensile strength sigma b, tensile strength σ s, hardness HRC, case hardness HRC, shrinkage factor δ to the bearing pin of embodiment 1-4,
Elongation ψ and toughness (impact absorbing energy Akv) are detected that testing result is as shown in table 1：
Table 1：The bearing pin of embodiment 1-4 and the property for passing through bearing pin obtained in common processing methods with 42CrMo in the prior art
Can test result
As it can be seen from table 1 bearing pin of the invention not only can reach high-strength pin steel in intensity and hardness should have
Requirement, bearing pin hardness is reached 25HRC, case hardness reaches more than 30HRC, also significantly improves the corrosion resistance of bearing pin.
Above example is merely to illustrate technical scheme rather than limiting the scope of the invention, although ginseng
The present invention is explained in detail according to preferred embodiment, it will be understood by those within the art that, can be to of the invention
Technical scheme is modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention.
Claims (7)
1. a kind of bearing pin, it is characterised in that the bearing pin is made up of the steel alloy of high intensity, and described steel alloy is by following quality
The chemical composition composition of percentage：C：0.20%-0.50%, Cr：2.50-2.80%, Mo：0.30%-0.80%, B：0.30-
0.60%, Ti：0.40-0.60%, Al：0.02%-0.20%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining
It is Fe；
The processing method of bearing pin comprises the following steps：
S1, pre-treatment：Chemical composition steel alloy as above is first carried out into acid pickling and rust removing, is air-dried, then the raw material after air-drying exists
Spheroidizing treatment is carried out at 760-780 DEG C, phosphorating treatment and wire drawing are carried out after samming treatment 5h-8h；
S2, shaping：By the shape needed for forming bearing pin in the presence of upset force through the raw material after above-mentioned treatment, and carry out successively
Turning, groove milling, thread rolling obtain bearing pin semi-finished product；
S3, heat treatment：Bearing pin semi-finished product are incubated 40-80min at 520-540 DEG C, 860-900 DEG C of insulation 40- is warming up to
80min, fast cooling is heated to 860-900 DEG C of insulation 40-80min to 520-550 DEG C of insulation 70-100min, is subsequently cooled to
Room temperature；
S4, surface treatment：Bearing pin semi-finished product after heat treatment are first cleaned into oil removing, ball blast, then is soaked in black Dacroment masking liquid
Apply or spray, then through 110-125 DEG C of baking 8-15min, then solidify 25-35min at 340-350 DEG C, finally in silicic acid
Seal treatment is carried out in salt coating, the solidification temperature of Seal treatment is 340-350 DEG C, and hardening time obtains bearing pin for 4-8min
Finished product；
Described black Dacroment masking liquid includes following component (counting by weight)：50 parts of epoxy resin；20-40 parts of black face
Material；50-60 parts of zinc powder；0.1-0.5 parts of dispersant；0.5-3 parts of alcoholic solvent；2-10 parts of chromic acid solution；40-100 parts of organic solvent.
2. bearing pin according to claim 1, it is characterised in that the bearing pin is made up of the steel alloy of high intensity, described
Steel alloy is made up of the chemical composition of following mass percent：C：0.25%-0.35%, Cr：2.60-2.80%, Mo：
0.40%-0.60%, B：0.35-0.55%, Ti：0.45-0.50%, Al：0.08%-0.15%, Si≤0.10%, S≤
0.030%, P≤0.030%, remaining is Fe.
3. bearing pin according to claim 1, it is characterised in that the case depth after step S3 heat treatments is 0.2-
0.4mm。
4. bearing pin according to claim 1, it is characterised in that the black pigment described in black Dacroment masking liquid is stone
One or more in ink, activated carbon, carbon black.
5. bearing pin according to claim 1, it is characterised in that the dispersant described in black Dacroment masking liquid is lauryl alcohol
One or more in APEO, tetradecyl alchohol APEO, hexadecanol APEO.
6. bearing pin according to claim 1, it is characterised in that the organic solvent described in black Dacroment masking liquid is benzene,
One or more in toluene, dimethylbenzene.
7. bearing pin according to claim 1, it is characterised in that the alcoholic solvent described in black Dacroment masking liquid is propyl alcohol,
One or more in isopropanol, n-butanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510559965.9A CN105112789B (en) | 2015-09-07 | 2015-09-07 | Hinge pin and machining method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510559965.9A CN105112789B (en) | 2015-09-07 | 2015-09-07 | Hinge pin and machining method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN105112789A CN105112789A (en) | 2015-12-02 |
| CN105112789B true CN105112789B (en) | 2017-05-24 |
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| CN201510559965.9A Active CN105112789B (en) | 2015-09-07 | 2015-09-07 | Hinge pin and machining method thereof |
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| CN105422590A (en) * | 2015-11-18 | 2016-03-23 | 宁波金鹏高强度紧固件有限公司 | Nut plate |
| CN106282819B (en) * | 2016-08-16 | 2018-02-09 | 宁波瑞国精机工业有限公司 | A kind of high-strength pin and its processing method |
| CN109957722A (en) * | 2019-04-10 | 2019-07-02 | 宁波瑞国精机工业有限公司 | A kind of self-locking position pin |
| CN110303304B (en) * | 2019-07-23 | 2022-03-15 | 重庆申耀机械工业有限责任公司 | Processing technique of roller |
| CN111546008A (en) * | 2020-05-14 | 2020-08-18 | 贵阳白云中航紧固件有限公司 | Large-scale pin shaft machining method |
| CN112094989B (en) * | 2020-07-28 | 2022-07-22 | 安徽绩溪徽山链传动有限公司 | Treatment process for prolonging service life of pin shaft |
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| SU1601188A1 (en) * | 1988-11-21 | 1990-10-23 | Предприятие П/Я А-1125 | Die steel |
| JP3360687B2 (en) * | 1991-03-28 | 2002-12-24 | 住友金属工業株式会社 | High-strength, high-toughness wear-resistant steel |
| FR2870546B1 (en) * | 2004-05-21 | 2006-09-01 | Industeel Creusot | STEEL WITH HIGH MECHANICAL RESISTANCE AND WEAR |
| CN100540706C (en) * | 2005-07-05 | 2009-09-16 | 杰富意钢铁株式会社 | The steel for mechanical structure of intensity, ductility and good-toughness and manufacture method thereof |
| JP2008274344A (en) * | 2007-04-27 | 2008-11-13 | Jfe Steel Kk | High-strength steel pipe having excellent delayed fracture resistance and fatigue characteristics |
| CN102559006A (en) * | 2011-12-13 | 2012-07-11 | 上海安福隆涂复工业有限公司 | Black dacromet paint |
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