CN102658455A - Manufacturing method for preventing long pin shaft of working device of excavator from deforming - Google Patents
Manufacturing method for preventing long pin shaft of working device of excavator from deforming Download PDFInfo
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- CN102658455A CN102658455A CN2012101373255A CN201210137325A CN102658455A CN 102658455 A CN102658455 A CN 102658455A CN 2012101373255 A CN2012101373255 A CN 2012101373255A CN 201210137325 A CN201210137325 A CN 201210137325A CN 102658455 A CN102658455 A CN 102658455A
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a manufacturing method for preventing a long pin shaft of a working device of an excavator from deforming. 42CrMo alloy steel is taken as a material; and the method is characterized by sequentially comprising the following steps: feeding; forging; normalizing; roughly turning an excircle; tempering; finely turning the excircle; quenching the excircle at medium frequency; straightening; tempering at low temperature; drilling a mesopore by taking an outer cylindrical surface as a positioning reference; and positioning by using the mesopore and grinding the excircle. By the method, the deformation of the long shaft of the working device of the excavator can be effectively controlled in a design and assembly requirement range in the manufacturing and heat treatment processes, and the comprehensive mechanical performance is high.
Description
Technical field
The present invention relates to a kind of bearing pin manufacturing approach, the have strong market potential manufacturing approach of shaft distortion of a kind of prevention of more specifically saying so, its bearing pin length>=650mm, shaft diameter≤95mm, material is the 42CrMo steel alloy.
Background technology
Bearing pin is as securing member; Be mainly used in the junction of two parts, important bearing pin is mainly concentrated and is used on equipment on the excavator, is used for the succession of power as mating formation; Therefore the intensity of axle, moulding and anti-wear performance are had relatively high expectations, crucial bearing pin is a material with the 42CrMo steel alloy often.
Existing manufacturing process is: blanking-rough turn cylindrical-modified-finish turning cylindrical-cylindrical mid frequency induction hardening-alignment-correct grinding cylindrical.Because of the heat treatment factor, receive the influence of autologous tissue and thermal stress in this manufacture process, size and dimension can take place inevitably change, axial length is long more, the axle that the diameter of axle is more little, and then the flexural deformation in the manufacture process is big more.Be used for the bearing pin that excavator swing arm is connected with platform at present; Its axial length>=650mm, shaft diameter≤95mm, distortion back linearity>=2mm/m in the heat treatment process; Therefore not only reduced the intensity of axle; Also make assembling increase difficulty, a heavy wear and phenomenon of rupture often take place, reduced service life, the increase of axle largely and made and the after-sales service cost at loading process.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point; A kind of have strong market potential manufacturing approach of shaft distortion of digger operating device of preventing is provided; Through the control deflection of axle in manufacture process of having strong market potential; Make the axle ability proof strength of having strong market potential, guarantee the assembling effect, increase the service life, reduce maintenance capacity, reduce use cost.
The present invention adopts following technical scheme for the technical solution problem:
The present invention prevents the have strong market potential manufacturing approach of shaft distortion of digger operating device; Be to be material with the 42CrMo steel alloy, be characterized in successively through blanking, forging, normalizing, rough turn cylindrical, modified, finish turning cylindrical, cylindrical mid frequency induction hardening, alignment, lonneal, corase grind cylindrical, with external cylindrical surface as positioning reference bore mesopore, mesopore location correct grinding cylindrical is accomplished manufacture process.
It is to carry out as follows that the present invention prevents the have strong market potential characteristics of manufacturing approach of shaft distortion of digger operating device:
(1), to being that the blanking blank of material forges with the 42CrMo steel alloy, the temperature insulation is after 1 hour eventually with 850 ℃ forgings, heating makes it reach 870 ℃ ± 10 ℃, be incubated 3 hours completion normalized treatment, coming out of the stove subsequently obtains blank A through naturally cooling to room temperature;
(2), utilize lathe that blank A is processed, the outside diameter that makes blank A obtains blank B greater than cylindrical intended diameter 0.5mm;
(3), carry out modified to blank B: at first vertical shove charge, be heated to 840 ℃ ± 10 ℃, be incubated 1.5 hours; Vertically get into quenching liquid then and carry out oil quenching, be cooled to room temperature; Come out of the stove after accomplishing the tempering heating in 2.5 hours with 620 ℃ ± 10 ℃ temperature insulation subsequently, naturally cool to room temperature and obtain blank C; Blank C finish turning cylindrical is obtained blank D;
(4), blank D is carried out cylindrical mid frequency induction hardening: blank D with the programming rate heat temperature raising to 900 of 400 ℃/min ℃, is incubated 35 seconds, sprays PAG water-emulsifiable liquid medium and be cooled to room temperature, obtain blank E; Utilize the hydraulic press alignment for blank E, make linearity≤0.2mm/m of blank E, carried out lonneal to room temperature in 4 hours with 220 ℃ ± 10 ℃ insulations again and obtain blank F;
(5), for blank F; Bore mesopore with external cylindrical surface as positioning reference; Go up cylindrical grinder grinding axle external cylindrical surface with the mesopore location again; In grinding shaft diameter to drawing intended diameter
scope, obtain required axle.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, the present invention is through the control deflection of axle in manufacture process of having strong market potential, make the axle of having strong market potential can a proof strength, guarantee the assembling effect, increase the service life, reduce maintenance capacity, reduction use cost.
2, the application of the inventive method can make in the axle length range of 650-3000mm, the linearity in the manufacture process is controlled at≤0.1mm/m in.
The specific embodiment
The have strong market potential manufacturing approach of shaft distortion of prevention digger operating device is to carry out as follows in the present embodiment:
1, to being that the blanking blank of material forges with the 42CrMo steel alloy, the temperature insulation is after 1 hour eventually with 850 ℃ forgings, and heating makes it reach 870 ℃ ± 10 ℃, be incubated 3 hours completion normalized treatment, and coming out of the stove subsequently obtains blank A through naturally cooling to room temperature; This process makes blank produce plastic deformation, eliminates defectives such as segregation, loose, pore, makes grain refinement, even tissue, obtain to have good machined and with the blank of mechanical property;
2, utilize lathe that blank A is processed, the outside diameter that makes blank A obtains blank B greater than cylindrical intended diameter 0.5mm;
3, carry out modified to blank B: at first vertical shove charge, be heated to 840 ℃ ± 10 ℃, be incubated 1.5 hours; Vertically get into quenching liquid then and carry out oil quenching, be cooled to room temperature; Come out of the stove after accomplishing the tempering heating in 2.5 hours with 620 ℃ ± 10 ℃ temperature insulation subsequently, naturally cool to room temperature and obtain blank C; Blank C finish turning cylindrical is obtained blank D; This process makes blank vertically go into the stress flexural deformation of stove can effectively prevent to quench the time, is engaged in when quenching and effectively avoids double swerve, then can prevent the lateral stressed distortion that causes, obtains the good tempered sorbite of combination property, and hardness is at 280HB ± 20HB;
4, blank D is carried out cylindrical mid frequency induction hardening: blank D with the programming rate heat temperature raising to 900 of 400 ℃/min ℃, is incubated 35 seconds, sprays PAG water-emulsifiable liquid medium and be cooled to room temperature, obtain blank E; Utilize the hydraulic press alignment for blank E, make linearity≤0.2mm/m of blank E, carried out lonneal to room temperature in 4 hours with 220 ℃ ± 10 ℃ insulations again and obtain blank F; This process is for obtaining the hardening depth of design, improve case hardness, increase the anti-wear performance of axle, keeping heart portion plasticity simultaneously; Residual stress is removed in the machinery alignment, avoids second order buckling;
5, for blank F; Bore mesopore with external cylindrical surface as positioning reference; Go up cylindrical grinder grinding axle external cylindrical surface with the mesopore location again; In grinding shaft diameter to drawing intended diameter
scope, obtain required axle.Be to locate mesopore with the external cylindrical surface on the workpiece as positioning reference in this step, the issuable flexural deformation of technological process before making it is eliminated in the correct grinding cylindrical.
Owing to adopt the technological process in the present embodiment; The digger operating device major axis is out of shape in making heat treatment process to be controlled effectively; Improve the mechanical performance of bearing pin; Prolong the service life of bearing pin, assembling has more easily improved quality, the assembly work efficient of product and has reduced cost simultaneously.
The surface texture of final axle is a tempered martensite, the about 55-60HRC of hardness, and the through hardening layer thickness reaches 3-3.5mm, and is mechanical integrated functional.
Claims (2)
1. one kind is prevented the have strong market potential manufacturing approach of shaft distortion of digger operating device; Be to be material with the 42CrMo steel alloy, it is characterized in that successively through blanking, forging, normalizing, rough turn cylindrical, modified, finish turning cylindrical, cylindrical mid frequency induction hardening, alignment, lonneal, corase grind cylindrical, with external cylindrical surface as positioning reference bore mesopore, mesopore location correct grinding cylindrical is accomplished manufacture process.
2. the have strong market potential manufacturing approach of shaft distortion of prevention digger operating device according to claim 1 is characterized in that carrying out as follows:
(1), to being that the blanking blank of material forges with the 42CrMo steel alloy, the temperature insulation is after 1 hour eventually with 850 ℃ forgings, heating makes it reach 870 ℃ ± 10 ℃, be incubated 3 hours completion normalized treatment, coming out of the stove subsequently obtains blank A through naturally cooling to room temperature;
(2), utilize lathe that blank A is processed, the outside diameter that makes blank A obtains blank B greater than cylindrical intended diameter 0.5mm;
(3), carry out modified to blank B: at first vertical shove charge, be heated to 840 ℃ ± 10 ℃, be incubated 1.5 hours; Vertically get into quenching liquid then and carry out oil quenching, be cooled to room temperature; Come out of the stove after accomplishing the tempering heating in 2.5 hours with 620 ℃ ± 10 ℃ temperature insulation subsequently, naturally cool to room temperature and obtain blank C; Blank C finish turning cylindrical is obtained blank D;
(4), blank D is carried out cylindrical mid frequency induction hardening: blank D with the programming rate heat temperature raising to 900 of 400 ℃/min ℃, is incubated 35 seconds, sprays PAG water-emulsifiable liquid medium and be cooled to room temperature, obtain blank E; Utilize the hydraulic press alignment for blank E, make linearity≤0.2mm/m of blank E, carried out lonneal to room temperature in 4 hours with 220 ℃ ± 10 ℃ insulations again and obtain blank F;
(5), for blank F; Bore mesopore with external cylindrical surface as positioning reference; Go up cylindrical grinder grinding axle external cylindrical surface with the mesopore location again; In grinding shaft diameter to drawing intended diameter
scope, obtain required axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101373255A CN102658455A (en) | 2012-05-04 | 2012-05-04 | Manufacturing method for preventing long pin shaft of working device of excavator from deforming |
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| CN2012101373255A CN102658455A (en) | 2012-05-04 | 2012-05-04 | Manufacturing method for preventing long pin shaft of working device of excavator from deforming |
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| CN2012101373255A Pending CN102658455A (en) | 2012-05-04 | 2012-05-04 | Manufacturing method for preventing long pin shaft of working device of excavator from deforming |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215428A (en) * | 2013-05-13 | 2013-07-24 | 许昌远东传动轴股份有限公司 | Thermal treatment method of spline shaft head of transmission shaft |
| CN103331583A (en) * | 2013-07-12 | 2013-10-02 | 徐州徐工铁路装备有限公司 | Caterpillar track hinge pin machining method |
| CN104493447A (en) * | 2014-12-26 | 2015-04-08 | 贵州虹祥轴承有限公司 | Processing technology of connecting rod shaft |
| CN105087879A (en) * | 2014-05-20 | 2015-11-25 | 遵义林棣科技发展有限公司 | H-type thermal refining method for long shaft workpiece |
| CN106607530A (en) * | 2015-10-27 | 2017-05-03 | 陕西宏远航空锻造有限责任公司 | Forging method for large aluminum alloy unfinished surface precision forgings |
| CN108526822A (en) * | 2018-04-12 | 2018-09-14 | 宣城东海汽车转向部件有限公司 | A kind of production method of non-maintaining connector shell |
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| GB766115A (en) * | 1954-04-13 | 1957-01-16 | Eaton Axles Ltd | Improvements in or relating to the manufacture of axle shafts |
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| JPH0233471A (en) * | 1988-07-22 | 1990-02-02 | Mitsubishi Electric Corp | Manufacture of output rotary shaft |
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| CN102384266A (en) * | 2011-10-21 | 2012-03-21 | 贵阳白云高原紧固件有限公司 | Multifunctional crown block piston rod |
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| GB766115A (en) * | 1954-04-13 | 1957-01-16 | Eaton Axles Ltd | Improvements in or relating to the manufacture of axle shafts |
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| JPH0233471A (en) * | 1988-07-22 | 1990-02-02 | Mitsubishi Electric Corp | Manufacture of output rotary shaft |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215428A (en) * | 2013-05-13 | 2013-07-24 | 许昌远东传动轴股份有限公司 | Thermal treatment method of spline shaft head of transmission shaft |
| CN103215428B (en) * | 2013-05-13 | 2015-01-07 | 许昌远东传动轴股份有限公司 | Thermal treatment method of spline shaft head of transmission shaft |
| CN103331583A (en) * | 2013-07-12 | 2013-10-02 | 徐州徐工铁路装备有限公司 | Caterpillar track hinge pin machining method |
| CN103331583B (en) * | 2013-07-12 | 2016-01-27 | 徐州徐工铁路装备有限公司 | A kind of Caterpillar track hinge pin processing method |
| CN105087879A (en) * | 2014-05-20 | 2015-11-25 | 遵义林棣科技发展有限公司 | H-type thermal refining method for long shaft workpiece |
| CN105087879B (en) * | 2014-05-20 | 2017-06-20 | 遵义然泰科技有限公司 | A kind of long axis workpiece H type hardening and tempering methods |
| CN104493447A (en) * | 2014-12-26 | 2015-04-08 | 贵州虹祥轴承有限公司 | Processing technology of connecting rod shaft |
| CN106607530A (en) * | 2015-10-27 | 2017-05-03 | 陕西宏远航空锻造有限责任公司 | Forging method for large aluminum alloy unfinished surface precision forgings |
| CN106607530B (en) * | 2015-10-27 | 2018-07-24 | 陕西宏远航空锻造有限责任公司 | A kind of forging method of the non-processing face fine forge piece of large aluminum alloy |
| CN108526822A (en) * | 2018-04-12 | 2018-09-14 | 宣城东海汽车转向部件有限公司 | A kind of production method of non-maintaining connector shell |
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Application publication date: 20120912 |