CN101058109A - Bars and tubes material unsymmetrical radial welding punched high performance precision blanking method - Google Patents
Bars and tubes material unsymmetrical radial welding punched high performance precision blanking method Download PDFInfo
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- CN101058109A CN101058109A CN 200710017999 CN200710017999A CN101058109A CN 101058109 A CN101058109 A CN 101058109A CN 200710017999 CN200710017999 CN 200710017999 CN 200710017999 A CN200710017999 A CN 200710017999A CN 101058109 A CN101058109 A CN 101058109A
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Abstract
The invention relates to a feeding method with the bar tube set on the asymmetrical radial impact forging precision feeding device which mainly comprises the micro tuning turbine, micro tuning base, micro tuning lever, hammer feeding cylinder, micro tuning worm, micro tuning base shaft sleeve, hammer pole, feeding cam, main shaft, hammer, with the micro tuning worm driven by the exchange servo generator, controlling the rotation angle of the micro tuning turbine, hammer lever being able to slide inside the main shaft slide slot, working curvature of the hammer lever matching with the feeding cam, pushing the radial down of the hammer lever, with one hammer pushed down one time, 4 hammers in even distribution, 7 cams forming into roller structure. When the main shaft drive hammer lever working in circumference movement, it drives the cam loading, using the bar fatigue broken principle, fostering the fissure expanding along the radial circumference, to finish feeding and get fine cross section quality.
Description
Technical field
The invention belongs to the nearly clear height of low energy consumption and imitate the precision molding technology field.Be specifically related to the asymmetric radial welding punched high performance precision blanking method of a kind of bars and tubes material, this method adopts and radially forges towards principle, realizes that the fatigue crack of bar under the cycle radial loaded circumferentially produces, expands until fracture, thereby finishes precise blanking.
Background technology
The cutting stock problems of metal bar material extensively are present among the procedure for preparation of cold extrusion, die forging, metal bracelet pin, rolling bearing roller, bolt, nut, pin, axle class part, and in these blanking operations, the blanking enormous amount, for example the annual metal bracelet length of producing in the township of the chain in Jinhua, Zhejiang area can reach more than one hundred million rice, the annual needle roller that needs in Beijing Needle Bearing Factory reaches up to ten million, and the annual cold-extruded part of producing of Liaoning Jinwei Auto Motor ﹠ Apparatus Co., Ltd. need descend bar to reach 2,000,000.But exist problems such as stock utilization is low, noise is big, die life is low, blanking pressure is big, production efficiency is low, energy consumption is high, cross section quality difference to some extent in the metal current bar baiting method commonly used, do not meet the green manufacturing STRATEGIES OF SUSTAINABLE DEVELOPMENT, develop the precise blanking technology of the energy-efficient material-saving of bar as early as possible and equip imperative, to promote Chinese machinery manufacturing industry development, the Revival of China mechanized equipment manufacturing industry.
Also be that the most direct the simplest precise blanking method comprises that lathe cuts off and old-fashioned hacksawing machine is sawed-off at first,, exist production efficiency low, waste shortcomings such as raw material are serious though these two kinds of baiting methods obtain smooth section.Though the early stage baiting method of hyper tape saw has had certain improvement, it is too low that its blanking efficient still shows, and can't satisfy large batch of requirement in the industrial production, and saw meets the waste raw material.For this reason, extensively adopt the method for shearing blanking on punch press or special-purpose bar shears in the industrial production afterwards, but common shearing blanking method blanking pressure is big, energy consumption is big, under the bar section present the tangible shape of a hoof, in order to satisfy next procedure such as cold-stamped requirement, have to after common shearing blanking, arrange again the operation of one smooth section of lathe turning, so just reduced production efficiency, wasted material, increased production cost.In view of the deficiency of shearing blanking mode, the low stress baiting method obtains people and greatly pays close attention to.
Bar low stress baiting method is applied to the theory of fracture mechanics among the precise blanking of bar, this method is a prefabricated circumferential surface crackle on bar artificially, bar to prefabricated circumferential surface crackle applies certain force shearing separation then, and make the bar fracture that the plastic deformation of macroscopic view the time not take place, carry out with the form of low stress brittle fracture.The researcher of the former Soviet Union had once designed a kind of based on bar rotation, the static tired blanking method of rotoflector of load the seventies in 20th century.Domestic scholars also begins to have carried out the tired blanking design of low stress rotoflector in the eighties, Xi'an Communications University forging and pressing teaching and research room in 1992 just the rotoflector fatigue blanking to common used material carried out the deep research of system, people such as professor Wei Qingtong of Gansu Polytechnical Univ have also carried out a large amount of research in this field.So years of researches flexural fatigue baiting method has had remarkable progress, for high strength inductile material, blanking as high-carbon steel, tool steel, bearing steel and high-speed steel etc. has embodied its superiority, but generally speaking, the productivity ratio of this baiting method is on the low side, the draw ratio L/D of bar is required big (requiring L/D 〉=1 usually), and therefore this cutting mode has big difficulty to the blanking of undercoat base, tends to cause that blanking pressure is big, cross section quality is poor.
The Yu Dehong of Xi'an Communications University professor, Zhao Sheng ton professor, Chen Jinde professor leader's research group since the research work of the low stress blanking of just being devoted to metal bar material the eighties in 20th century, the low stress cutting method of proposition has obtained national inventing patent.The shear stress level of this method is low, and productivity ratio is very high, causes the workpiece distortion of detrusion very little even do not have, and has improved the quality of shearing bar greatly, therefore is well suited for ferrous metal particularly high rigidity and inductile material blanking.But it is limited that its applicable material ranges still shows, and is difficult to break through the qualification of material draw ratio.
Summary of the invention
, the objective of the invention is to both at home and abroad in the problem that exists aspect the efficient blanking of bars and tubes material in view of at present, provide a kind of bars and tubes material asymmetric radial welding punched high performance precision blanking method, and finished designing and developing of machine structural parts.
In order to realize above-mentioned task, the present invention takes following technical solution:
The asymmetric radial welding punched high performance precision blanking method of a kind of bars and tubes material, it is characterized in that, this method is installed in asymmetric radially the forging on the precise blanking device with bars and tubes material, this asymmetric radially forging towards the main working parts of precise blanking device comprises main shaft, fuselage, fine setting worm gear, fine setting pedestal, regulating rod, tup feeding cylinder, fine setting worm screw, fine setting pedestal axle sleeve, hammer lever, feed cam, main shaft, tup; The fine setting worm screw is driven by AC servomotor, the angle that control fine setting worm gear turns over, and fine setting worm gear drives regulating rod turns over an angle, and the fine setting pedestal will rotate; Hammer lever can slide in the main shaft sliding tray, and the hammer lever working curved surface cooperates with feed cam, promotes radially depressing of hammer lever; Have only a tup to be depressed constantly for guaranteeing each, adopt 4 tups evenly to arrange, 7 feed cams are formed circular roller structure, when the main shaft drives hammer lever carries out circular motion, hammer lever drives tup and just constantly radially loads to bar under the effect of feed cam, utilizes the fatigue fracture mechanism of bar, impels crackle by the radially circumference expansion of bar surface, thereby finish blanking, and obtain good cross section quality.
The present invention has advantages such as the range of work is wide, efficient is high, quality is good.The major technique characteristics are as follows: the complete circumferentially CYCLIC LOADING of 4 tups, 7 rollers, realize the tired blanking of 28 radial loaded of single-revolution; The worm and gear transmission system that radial stroke is adjustable, controlled stroke scope 0～4mm can process the bar of different materials, different-diameter; The variable frequency speed modulation of asynchronous motor system sets up intelligent control system, and functions such as the collection of realization blanking parameter, optimization, control can realize that diameter 10mm～ 55mm, draw ratio are 0.2～10 bar blanking.The main working parts of this blanking system comprises: radially forge circumferential load maintainer, can finish unidirectional loading of moment, the dutycycle 0.5 of load time; Gerotor type tup curved-surface structure, assurance blanking process does not have impact, and the overload phenomenon has dynamics stably, maximum radial acceleration 3.5m/s
2, maximum inertia force 8.75N; The worm and gear of radial stroke is reconciled mechanism, and worm gear adopts the branch body wall type structure of dismounting capable of being combined, can effectively reduce the total quality that stroke is reconciled mechanism, improves dynamic performance, and guarantees the security and the self-locking performance of blanking machine.
Description of drawings
Fig. 1 is a blanking device schematic diagram of the present invention;
Fig. 2 is that working curve is drafted;
Fig. 3 is the operating rate curve;
Fig. 4 is the work accelerating curve;
Stress cloud atlas when Fig. 5 is tup drafts 0.2mm;
Stress cloud atlas when Fig. 6 is tup drafts 0.1mm;
The present invention is described in further detail below in conjunction with embodiment that accompanying drawing and inventor provide.
The specific embodiment
Bars and tubes material of the present invention is asymmetric radially to be forged towards precise blanking method, is the fatigue fracture mechanism of utilizing bars and tubes material, radially depresses CYCLIC LOADING by tup along bars and tubes material.Tup working profile curve adopts cycloid, and it can do the radial slippage motion under the constraint that radially slides groove.For realizing the radial feed motion of tup, adopt cylindrical cam to be mated, cylindrical cam can freely rotate around its central axis, and relative motion is rolling friction between tup and the cylindrical cam.The bars and tubes material transfixion that is fixed adopts 4 tups evenly arranging, constantly contact with circumferential 7 cylindrical cams, thereby continuous imposed load radially impels the generation and the expansion of fatigue crack, thereby finishes precise blanking.For realizing the radially continuous adjusting of drafts, adopt the worm and gear governor motion, realize that radially drafts is regulated continuously.
Blanking device of the present invention as shown in Figure 1, main working parts comprises parts such as main shaft, fuselage, also comprise the fine setting worm gear 1, the fine setting pedestal 2, regulating rod 3, tup feeding cylinder 4, fine setting worm screw 5, fine setting pedestal axle sleeve 6, hammer lever 7, feed cam 8, main shaft 9, tup 10; Hammer lever 7 and fine setting worm screw 5 eccentric placement the on the fine setting pedestal.Hammer lever 7 can slide in the main shaft sliding tray, and hammer lever 7 working curved surfaces cooperate with feed cam 8, promotes radially depressing of hammer lever 7.For guaranteeing each moment, have only a tup 10 to be depressed, adopt 4 tups 10 evenly to arrange, 7 feed cams 8 are formed circular roller structures.Bars and tubes material is fixed on the center by fixture.When the main shaft drives tup carried out circular motion, tup just constantly radially loaded to bar under the effect of feed cam, thereby finishes blanking.
Performances such as the kinematics of these workpieces, mechanics have bigger influence to the service behaviour of blanking machine, respectively above-mentioned parts are described below.
For guaranteeing that tup has kinematics performance preferably, various stroke curves such as offset of sinusoidal, cosine, cycloid have carried out computational analysis respectively.The analysis showed that there are the inertia force impact phenomenon in sine and cosine stroke curve, will cause the impulsive force bigger to body under the high speed rotating state; The cycloid stroke curve does not then have impact phenomenon, and kinetic characteristic is steady, so adopted cycloid as the hammer stroke curve.According to the requirement of the trip curve, design the working curve of this hammer lever, mentality of designing is as shown in Figure 2.Adopt reversal process to determine tup pitch curve equation, can determine tup real work profile by the envelope rule, and be expressed as the parametric equation form, as the formula (1).
Wherein, x
c, y
cBe respectively the coordinate of pitch curve, x
d, y
dBe respectively the coordinate of real work profile, be the radius of roller, ρ is the radius of curvature of pitch curve, as the formula (2).
Thus, can obtain the movement velocity and the acceleration equation of tup, shown in (3) and (4).
Wherein, θ
τ=wt represents the tup work anglec of rotation.The rate curve of this tup working curve as shown in Figure 3, accelerating curve is as shown in Figure 4.As seen this speed and accelerating curve change steadily, do not have and impact.In addition,, can be discussed various forms of stroke curves respectively,, all be had impact phenomenon, thereby be determined the cycloid working curve of tup as sine curve, cosine curve, polynomial curve etc. by this mentality of designing.
According to designing requirement, for the suitable bars and tubes material of draw ratio under requiring can directly radially forge the impact machine loading and unloading at this, need not add other add-on parts; If but the bar draw ratio under requiring too little, such as the bar that will seek out the long 24mm of diameter 55mm, shearing stress during blanking on the bar V-type channel section is much larger than tension, therefore can directly cut off bar, but this cutting mode had not both made full use of the stress concentration effect at V-type groove tip, reached the purpose by the expansion of I type crackle; Need very big applied force again.The researcher of seminar proposes to add a sleeve on bar in the process of mould design for this reason, and to increase the draw ratio of bar, the most advanced and sophisticated suffered stress of V-type groove is based on tension when reaching blanking, and the realization crackle is pressed the purpose of I type expansion.In order to investigate the feasibility of this blanking scheme, 45# rod iron material has been carried out the ANSYS finite element numerical analysis.Bar carries out finite element modelling near the stress its V-type groove tip under different initial tup drafts.Diameter is respectively the bar of 55mm, applies the initial load (radially drafts) of 0.2mm, 0.1mm at the sleeve left end of distance V-type groove root 120mm, bar at the tension cloud atlas at the most advanced and sophisticated place of V-type groove respectively as shown in Figure 5 and Figure 6.
From top two tension cloud atlas as can be seen, radially forge when the initial depression amount of blanking machine tup is 0.2mm when asymmetric, diameter is the strength degree (σ that the tension at 55mm bar V-type groove tip has surpassed material
b=600MPa), promptly produced local fine crack (damage).This explanation is by applying sleeve to strengthen the arm of force to the less bar of draw ratio, and given tup one initial depression amount, the tip of V-type groove can produce initial crack, subsequently along with the increase of bar amount of deflection, fatigue crack can be expanded gradually up to the bar fracture, and this process is controlled by AC servo motor.In addition by calculating the peak power that the minimum initial depression amount of tup can also obtain this blanking machine master motor, because when bar produces after the initial macroscopic cracking, expand lentamente in order to guarantee crackle, obtain high-quality blanking section, applied external force should reduce along with the increase of crack length, and the amount of deflection of bar should increase along with the increase of crack length.This can control the tup drafts by AC servomotor and regulate.This shows radially forging that the present invention proposes towards the feasibility of the design of blanking machine.
Claims (2)
1. asymmetric radially forging of bars and tubes material towards precise blanking method, it is characterized in that, this method is installed in asymmetric radially the forging on the precise blanking device with bars and tubes material, described asymmetric radially the forging towards the main working parts of precise blanking device comprises main shaft, fuselage, fine setting worm gear, fine setting pedestal, regulating rod, tup feeding cylinder, fine setting worm screw, fine setting pedestal axle sleeve, hammer lever, feed cam, main shaft, tup; The fine setting worm screw is driven by AC servomotor, the angle that control fine setting worm gear turns over, and fine setting worm gear drives regulating rod turns over an angle, and the fine setting pedestal will rotate; Hammer lever slides in the main shaft sliding tray, and the hammer lever working curved surface cooperates with feed cam, promotes hammerhead radial and depresses; Have only a tup to be depressed constantly for guaranteeing each, adopt 4 tups evenly to arrange, 7 feed cams are formed circular roller structure, when the main shaft drives hammer lever carries out circular motion, hammer lever drives tup and just constantly radially loads to bar under the effect of feed cam, utilizes the fatigue fracture mechanism of bar, impels crackle by the radially circumference expansion of bar surface, thereby finish blanking, and obtain good cross section quality.
2. the method for claim 1 is characterized in that, described hammer lever and fine setting worm screw eccentric placement the on the fine setting pedestal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100179990A CN100453204C (en) | 2007-06-05 | 2007-06-05 | Bars and tubes material unsymmetrical radial welding punched high performance precision blanking method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100179990A CN100453204C (en) | 2007-06-05 | 2007-06-05 | Bars and tubes material unsymmetrical radial welding punched high performance precision blanking method |
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| CN101058109A true CN101058109A (en) | 2007-10-24 |
| CN100453204C CN100453204C (en) | 2009-01-21 |
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Cited By (11)
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| CN102700668A (en) * | 2012-06-12 | 2012-10-03 | 天津轻钛运动器材有限公司 | Titanium alloy seamless pipe with variable wall thickness as well as radial forging and forming mechanism and method of titanium alloy seamless pipe |
| CN101977703B (en) * | 2008-03-31 | 2013-03-27 | 住友金属工业株式会社 | Method of producing seamless metal tube and punch for use therein |
| CN103008433A (en) * | 2012-11-29 | 2013-04-03 | 西安交通大学 | Low-stress and high-efficiency precise blanking method for medium-high frequency inductive heating of rod tube material |
| CN103317320A (en) * | 2013-05-23 | 2013-09-25 | 西安交通大学 | Efficient precise blanking method for pipe thermal stress prefabrication microcracks |
| CN104001784A (en) * | 2014-05-21 | 2014-08-27 | 西安交通大学 | Mechanical rod and pipe material blanking machine directly driven by multiple alternating-current servo motors |
| CN104493034A (en) * | 2014-10-31 | 2015-04-08 | 西安交通大学 | Radial asymmetric feeding device driven by liquefied natural gas |
| CN106552854A (en) * | 2016-11-28 | 2017-04-05 | 中国石油大学(华东) | A kind of frequency conversion centrifugation rod pipe feeding machine based on compensation hydraulic |
| CN109955044A (en) * | 2019-04-18 | 2019-07-02 | 中国石油大学(华东) | A kind of radial direction breaks the low stress blanking machine of disconnected high-efficiency and precision |
| CN110014072A (en) * | 2019-04-18 | 2019-07-16 | 中国石油大学(华东) | A kind of radial direction breaks the low stress baiting method of disconnected high-efficiency and precision |
| CN111299414A (en) * | 2020-02-25 | 2020-06-19 | 中国石油大学(华东) | Deflection controllable and cracked tip passivation expansion radius compensation mechanism |
| CN112588937A (en) * | 2020-12-03 | 2021-04-02 | 中国石油大学(华东) | Low-stress blanking die and method in pure rolling contact with bar stock |
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| AT329349B (en) * | 1973-11-15 | 1976-05-10 | Gfm Fertigungstechnik | FAST-RUNNING SHORT-STROKE FORGING PRESS |
| CN1010289B (en) * | 1988-12-12 | 1990-11-07 | 西安交通大学 | Low stress impact shearing method |
| CN1314497C (en) * | 2005-01-28 | 2007-05-09 | 武汉理工大学 | Blank high efficiency precise blanking method for cold forging |
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2007
- 2007-06-05 CN CNB2007100179990A patent/CN100453204C/en not_active Expired - Fee Related
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| CN101977703B (en) * | 2008-03-31 | 2013-03-27 | 住友金属工业株式会社 | Method of producing seamless metal tube and punch for use therein |
| CN102700668B (en) * | 2012-06-12 | 2013-11-13 | 天津轻钛运动器材有限公司 | Titanium alloy seamless pipe with variable wall thickness as well as radial forging and forming mechanism and method of titanium alloy seamless pipe |
| CN102700668A (en) * | 2012-06-12 | 2012-10-03 | 天津轻钛运动器材有限公司 | Titanium alloy seamless pipe with variable wall thickness as well as radial forging and forming mechanism and method of titanium alloy seamless pipe |
| CN103008433A (en) * | 2012-11-29 | 2013-04-03 | 西安交通大学 | Low-stress and high-efficiency precise blanking method for medium-high frequency inductive heating of rod tube material |
| CN103317320A (en) * | 2013-05-23 | 2013-09-25 | 西安交通大学 | Efficient precise blanking method for pipe thermal stress prefabrication microcracks |
| CN104001784B (en) * | 2014-05-21 | 2015-12-09 | 西安交通大学 | The mechanical type bars and tubes material blanking machine that a kind of multiple alternating current servo motor direct drives |
| CN104001784A (en) * | 2014-05-21 | 2014-08-27 | 西安交通大学 | Mechanical rod and pipe material blanking machine directly driven by multiple alternating-current servo motors |
| CN104493034B (en) * | 2014-10-31 | 2016-02-24 | 西安交通大学 | The radial asymmetrical blanking device that a kind of liquefied natural gas drives |
| CN104493034A (en) * | 2014-10-31 | 2015-04-08 | 西安交通大学 | Radial asymmetric feeding device driven by liquefied natural gas |
| CN106552854A (en) * | 2016-11-28 | 2017-04-05 | 中国石油大学(华东) | A kind of frequency conversion centrifugation rod pipe feeding machine based on compensation hydraulic |
| CN109955044A (en) * | 2019-04-18 | 2019-07-02 | 中国石油大学(华东) | A kind of radial direction breaks the low stress blanking machine of disconnected high-efficiency and precision |
| CN110014072A (en) * | 2019-04-18 | 2019-07-16 | 中国石油大学(华东) | A kind of radial direction breaks the low stress baiting method of disconnected high-efficiency and precision |
| CN109955044B (en) * | 2019-04-18 | 2020-12-01 | 中国石油大学(华东) | Efficient and precise low-stress blanking machine capable of radially breaking off |
| CN111299414A (en) * | 2020-02-25 | 2020-06-19 | 中国石油大学(华东) | Deflection controllable and cracked tip passivation expansion radius compensation mechanism |
| CN111299414B (en) * | 2020-02-25 | 2021-11-19 | 中国石油大学(华东) | Deflection controllable and cracked tip passivation expansion radius compensation mechanism |
| CN112588937A (en) * | 2020-12-03 | 2021-04-02 | 中国石油大学(华东) | Low-stress blanking die and method in pure rolling contact with bar stock |
| CN112588937B (en) * | 2020-12-03 | 2022-07-26 | 中国石油大学(华东) | Low-stress blanking die and method in pure rolling contact with bar stock |
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Application publication date: 20071024 Assignee: Liuzhou Gaohua Machine Co., Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2009450000043 Denomination of invention: Bars and tubes material unsymmetrical radial welding punched high performance precision blanking method Granted publication date: 20090121 License type: Exclusive License Record date: 20090708 |
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Granted publication date: 20090121 Termination date: 20130605 |