CN103286249B - Variable-speed circumferential low-stress bending fatigue crack precise blanking machine and blanking method thereof - Google Patents
Variable-speed circumferential low-stress bending fatigue crack precise blanking machine and blanking method thereof Download PDFInfo
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- CN103286249B CN103286249B CN201310234144.9A CN201310234144A CN103286249B CN 103286249 B CN103286249 B CN 103286249B CN 201310234144 A CN201310234144 A CN 201310234144A CN 103286249 B CN103286249 B CN 103286249B
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Abstract
The invention discloses a variable-speed circumferential low-stress bending fatigue crack precise blanking machine and a blanking method of the variable-speed circumferential low-stress bending fatigue crack precise blanking machine. The variable-speed circumferential low-stress bending fatigue crack precise blanking machine comprises a variable-frequency motor, a large belt pulley, a V-shaped belt, a small belt pulley, a two-stage gear accelerator, a high-speed main shaft, a sliding rail supporting seat, a screw compression spring, a columnar hammer head, a feeding sleeve, a ball guide bushing, metal bars, a clamping hand, a clamping cylinder, a feeding cylinder, a hydraulic clamping feeding mechanism support, a machine body, a seat plate, a servo motor, a speed reducer, a coupler, a ball screw supporting seat, a screw, a nut, a ball screw, a deep groove ball bearing and a key. The variable-speed circumferential low-stress bending fatigue crack precise blanking machine is high in geometric precision of blanking workbanks, free of corner collapse and radial deformation, perpendicular and smooth in fracture section, few in burrs, and high in use ratio of material. The stress concentration effect, the resonance effect and the bending fatigue of an annular V-shaped groove are utilized to enable the critical value of the impact speed of vibration on the metal bars to be lower than the critical value of the speed in the high-speed shearing process, and the blanking machine is applicable to precise blanking of the metal bars of different materials.
Description
Technical field
The present invention relates to a kind of speed change circumference low stress crooked fatigue fracture precision blanking machine and baiting method thereof, belong to machining device technical field.
Background technology
In metallic article and machine industry, blanking is the first operation of metal forming processing, and it is widely used in the procedure for preparation of die forging, cold extrusion, metal bracelet pin, bolt, rolling bearing roller, auto parts machinery production etc.The current domestic bar amount of precise blanking that needs every year reaches up to ten million ton, is often only motorcycle chain demand and just reaches 8000 myriametres, and the demand of internal combustion engine piston pin reaches 2,000 ten thousand etc.
Low stress blanking is applied to by crack technology in bar blanking, and a first prefabricated circumferential crack on billet surface artificially, then applies certain external force to the bar with circumferential surface crack, make it with the form Dynamic Separation of low stress brittle fracture.According to the difference of bar fracture mechanism, low stress blanking generally can be divided into three kinds of forms such as the type of fractureing, impact shear type and bend fracture type.The low stress type blanking efficiency that fractures is high, but the expansion of crackle is difficult to control, and limits its application and development.Low stress impact shearing-type blanking efficiency is higher, but energy consumption and vibration noise are very large, and die wear is serious.So low stress bend fracture blanking is acknowledged as the following precise blanking method having development potentiality most, it makes full use of notch effect and the curvature effect of hoop V-type groove, realize the brittle failure of material under low stress level, obtain without geometric distortion, fracture vertically smooth, without the need to the blank of chamfering.
But current low stress bends baiting method has the following disadvantages: (1) crack initiation time is longer, causes blanking total time still longer and unstable.(2) have the hit district that (ellipse) is circular, section projection height and cup depth are still large.(3) in the Crack Extension stage, external force suffered by bar is the impact shock power of unrealized closed-loop control, causes overall cross section quality unstable.
By common metal material low stress is bent to think after blanking is analysed in depth cause current low stress to bend baiting method to there is above-mentioned deficiency relevant with the mode of action of external force suffered by bar, this is because in whole blanking process: (1) is under the measure not taking effective crack initiation, the problems such as lathe tool wearing and tearing and life-span thereof cause can not be too little with the root fillet radius of the prefabricated V-type groove of method for turning, and then the stress making it produce concentrate can not be too large, cause often accounting for about 70% of blanking total time to forming the radius of corner infinitesimal crackle time used after the V-type groove loading had compared with Rouno Cormer Pregrinding Wheel radius, the crack initiation time is long, and required initial external force is larger, (2) external force suffered by bar is only directly be applied to one by one on billet surface by power set, transmission system and blanking mold, the parameters such as crack propagation velocity, V-type groove physical dimension, material character are not fed back to input to the impact of external force suffered by bar, one " open cycle system " in essence, cause the unrealized regular change along with the expansion of crackle in controlled range of external force suffered by V-type groove tip, this is the basic reason that Whole blanking section flatness and perpendicularity are not high, (3) external force suffered by bar is two power of symmetrical effect up and down, or is interrupted multiple power of hitting, or bending power.Though it is most advanced and sophisticated along the several stress point of its place section toward bar Center Extender from V-type groove that this mode of action is conducive to crackle, reduce the blanking time.But also can because of radius same on bar section respectively rupture (damage) put stressed obvious inequality, cause its circumferential crack expansion rate asynchronous, and then produce different fracture zone; (4) the Crack Extension stage adopts Impulsive load or is interrupted strike mode and carries out low stress blanking to bar, though be conducive to reducing external force suffered by bar, now Crack Extension is difficult to control, and namely the moving mold inertia effect also not easily dies, and the blanking time is unstable.If initial vibration power is little, crackle may be caused not expand all the time or expand slowly, causing productivity ratio low; If initial vibration power is large, bar hit may be made due to the moment expansion of crackle, cause blanking poor quality, vibration & noise large.
Summary of the invention
(1) technical problem that will solve
For solving the problem, the present invention proposes a kind of speed change circumference low stress crooked fatigue fracture precision blanking machine.
(2) technical scheme
Speed change circumference low stress crooked fatigue fracture precision blanking machine of the present invention, comprises variable-frequency motor, large belt wheel, V-type band, small pulley, two-stage gear accelerator, high-speed main spindle, rail plate supporting seat, spiral compression spring, column tup, feeding sleeve, ball bearing guide bushing, metal bar material, tong, clamping cylinder, feed cylinder, hydraulic clamp feed mechanism support, fuselage, seat board, servomotor, reductor, shaft coupling, ball-screw supporting seat, screw, nut, ball-screw, deep groove ball bearing and key; Described variable-frequency motor is connected with large belt wheel; Described large belt wheel is connected with small pulley by V-type band; Described small pulley is fixed on the power shaft of two-stage gear accelerator by key; The output shaft of described two-stage gear accelerator is fixed together by screw and high-speed main spindle; Described high-speed main spindle supports the inwall of side rail plate supporting seat by deep groove ball bearing; Described column tup is arranged on high-speed main spindle by ball bearing guide bushing; Described servomotor is connected with reductor, and the output shaft of reductor is connected with ball-screw by described shaft coupling; Described ball-screw is supported by ball-screw supporting seat; Screw pair is formed between described ball-screw and nut; Nut and feeding sleeve are fixed together by described screw; Described column tup is between high-speed main spindle and feeding sleeve; Described clamping cylinder and feed cylinder are fixed on hydraulic clamp feed mechanism support; Described hydraulic clamp feed mechanism support and fuselage and seat board are fixed.
Further, described high-speed main spindle maximum speed is 25000 turns per minute.
Further, described variable-frequency motor drives the column tup work be placed on high-speed main spindle by V-type band, produces resonance effects, the most advanced and sophisticated crack initiation of induction V-type groove.
Further, the endoporus of described feeding sleeve reduces along its axial direct line style, forms oblique angle.
Further, described column tup is made up of antifriction antiwear material.
Speed change circumference low stress crooked fatigue fracture baiting method of the present invention, it comprises the following steps:
1) external force is applied to metal bar material:
External force needed for metal bar material is by feed mechanism moving metal bar and then column tup is changed to the distance between the application point of the power of metal bar material and V-type groove;
2) the Crack Extension stage:
Under maximum initial external force, make bar V-type groove tip generate macroscopic cracking fast;
3) bar amount of deflection controls:
The drafts that bar amount of deflection can drive the gradually little feeding sleeve of axially internal diameter to finely tune column tup by servo-controlled ball-screw changes;
4) the stressed correction of crackle:
Real-time detection also obtains bar stress point and closes on the arm of force signal between V-type groove tip, and it can be used as the feedback signal in blanking machine closed-loop control, real-time whole process corrects the Extended workflow-net of crackle, makes it be in a scope allowed, and realizes the flexible dynamic expansion of the most advanced and sophisticated circumferential crack of V-type groove.
(3) beneficial effect
The present invention compared with prior art, it has following beneficial effect: speed change circumference low stress crooked fatigue fracture precision blanking machine of the present invention and baiting method thereof, blank geometric accuracy is high, without collapsing angle, without radial distortion, fracture is more smooth, burr is few, stock utilization is high, what make use of that the stress concentration effect of endless v-groove, resonance effects and flexural fatigue makes the critical value of metal bar material vibration impact velocity than during high speed shear is low, is applicable to the precise blanking of the metal bar material of multiple unlike material.
Accompanying drawing explanation
Fig. 1 is front view of the present invention;
Fig. 2 is top view of the present invention;
Fig. 3 is encircled portion partial enlarged drawing in Fig. 1.
1-variable-frequency motor; The large belt wheel of 2-; 3-V type band; 4-small pulley; 5-two-stage gear accelerator; 6-high-speed main spindle; 7-rail plate supporting seat; 8-spiral compression spring; 9-column tup; 10-feeding sleeve; 11-ball bearing guide bushing; 12-metal bar material; 13-tong; 14-clamping cylinder; 15-feed cylinder; 16-hydraulic clamp feed mechanism support; 17-fuselage; 18-seat board; 19-servomotor; 20-reductor; 21-shaft coupling; 22-ball-screw supporting seat; 23-screw; 24-nut; 25-ball-screw; 26-deep groove ball bearing; 27-key.
Detailed description of the invention
As Fig. 1, a kind of speed change circumference low stress crooked fatigue fracture precision blanking machine shown in Fig. 2 and Fig. 3, comprise variable-frequency motor 1, large belt wheel 2, V-type band 3, small pulley 4, two-stage gear accelerator 5, high-speed main spindle 6, rail plate supporting seat 7, spiral compression spring 8, column tup 9, feeding sleeve 10, ball bearing guide bushing 11, metal bar material 12, tong 13, clamping cylinder 14, feed cylinder 15, hydraulic clamp feed mechanism support 16, fuselage 17, seat board 18, servomotor 19, reductor 20, shaft coupling 21, ball-screw supporting seat 22, screw 23, nut 24, ball-screw 25, deep groove ball bearing 26 and key 27, described variable-frequency motor 1 is connected with large belt wheel 2, described large belt wheel 2 is connected with small pulley 4 by V-type band 3, described small pulley 4 is fixed on the power shaft of two-stage gear accelerator 5 by key 27, the output shaft of described two-stage gear accelerator 5 is fixed together by screw 23 and high-speed main spindle 6, described high-speed main spindle supports the inwall of side rail plate supporting seat by deep groove ball bearing, described column tup 9 is arranged on high-speed main spindle 6 by ball bearing guide bushing 11, described servomotor 19 is connected with reductor 20, and the output shaft of reductor 20 is connected with ball-screw 25 by described shaft coupling 21, described ball-screw 25 is supported by ball-screw supporting seat 22, screw pair is formed between described ball-screw 25 and nut 24, nut 24 and feeding sleeve 10 are fixed together by described screw 23, described column tup 9 is between high-speed main spindle 6 and feeding sleeve 10, described clamping cylinder 14 and feed cylinder 15 are fixed on hydraulic clamp feed mechanism support 16, described hydraulic clamp feed mechanism support 16 and fuselage 17 and seat board 18 are fixed.
Wherein, described high-speed main spindle 6 maximum speed is 25000 turns per minute; Described variable-frequency motor 1 drives the column tup 9 be placed on high-speed main spindle 6 to work by V-type band 3, produces resonance effects, the most advanced and sophisticated crack initiation of induction V-type groove; The endoporus of described feeding sleeve 10 reduces along its axial direct line style, forms oblique angle; Described column tup 9 is made up of antifriction antiwear material.
Speed change circumference low stress crooked fatigue fracture baiting method of the present invention, it comprises the following steps:
5) external force is applied to metal bar material:
External force needed for metal bar material is by feed mechanism moving metal bar and then column tup is changed to the distance between the application point of the power of metal bar material and V-type groove;
6) the Crack Extension stage:
Under maximum initial external force, make bar V-type groove tip generate macroscopic cracking fast;
7) bar amount of deflection controls:
The drafts that bar amount of deflection can drive the gradually little feeding sleeve of axially internal diameter to finely tune column tup by servo-controlled ball-screw changes;
8) the stressed correction of crackle:
Real-time detection also obtains bar stress point and closes on the arm of force signal between V-type groove tip, and it can be used as the feedback signal in blanking machine closed-loop control, real-time whole process corrects the Extended workflow-net of crackle, makes it be in a scope allowed, and realizes the flexible dynamic expansion of the most advanced and sophisticated circumferential crack of V-type groove.
Speed change circumference low stress crooked fatigue fracture precision blanking machine of the present invention, blank geometric accuracy is high, without collapsing angle, without radial distortion, fracture is more smooth, and burr is few, and stock utilization is high, what make use of that the stress concentration effect of endless v-groove, resonance effects and flexural fatigue makes the critical value of metal bar material vibration impact velocity than during high speed shear is low, is applicable to the precise blanking of the metal bar material of multiple unlike material.
Embodiment recited above is only be described the preferred embodiment of the present invention, not limits the spirit and scope of the present invention.Under the prerequisite not departing from design concept of the present invention; the various modification that this area ordinary person makes technical scheme of the present invention and improvement; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, all records in detail in the claims.
Claims (5)
1. a speed change circumference low stress crooked fatigue fracture precision blanking machine, is characterized in that: comprise variable-frequency motor, large belt wheel, V-type band, small pulley, two-stage gear accelerator, high-speed main spindle, rail plate supporting seat, spiral compression spring, column tup, feeding sleeve, ball bearing guide bushing, metal bar material, tong, clamping cylinder, feed cylinder, hydraulic clamp feed mechanism support, fuselage, seat board, servomotor, reductor, shaft coupling, ball-screw supporting seat, screw, nut, ball-screw, deep groove ball bearing and key; Described variable-frequency motor is connected with large belt wheel; Described large belt wheel is connected with small pulley by V-type band; Described small pulley is fixed on the power shaft of two-stage gear accelerator by key; The output shaft of described two-stage gear accelerator is fixed together by screw and high-speed main spindle; Described high-speed main spindle supports the inwall of side rail plate supporting seat by deep groove ball bearing; Described column tup is arranged on high-speed main spindle by ball bearing guide bushing; Described servomotor is connected with reductor, and the output shaft of reductor is connected with ball-screw by described shaft coupling; Described ball-screw is supported by ball-screw supporting seat; Screw pair is formed between described ball-screw and nut; Nut and feeding sleeve are fixed together by described screw; Described column tup is between high-speed main spindle and feeding sleeve; Described clamping cylinder and feed cylinder are fixed on hydraulic clamp feed mechanism support; Described hydraulic clamp feed mechanism support and fuselage and seat board are fixed, and described variable-frequency motor drives the column tup work be placed on high-speed main spindle by V-type band, produce resonance effects, the most advanced and sophisticated crack initiation of induction V-type groove.
2. speed change circumference low stress crooked fatigue fracture precision blanking machine according to claim 1, is characterized in that: described high-speed main spindle maximum speed is 25000 turns per minute.
3. speed change circumference low stress crooked fatigue fracture precision blanking machine according to claim 1, is characterized in that: the endoporus of described feeding sleeve reduces along its axial direct line style, forms oblique angle.
4. speed change circumference low stress crooked fatigue fracture precision blanking machine according to claim 1, is characterized in that: described column tup is made up of antifriction antiwear material.
5. a speed change circumference low stress crooked fatigue fracture baiting method, is characterized in that: the method is completed by claim 1-4 arbitrary described speed change circumference low stress crooked fatigue fracture precision blanking machine, and it comprises the following steps:
1) external force is applied to metal bar material:
External force needed for metal bar material is by feed mechanism moving metal bar and then column tup is changed to the distance between the application point of the power of metal bar material and V-type groove;
2) the Crack Extension stage:
Under maximum initial external force, make bar V-type groove tip generate macroscopic cracking fast;
3) bar amount of deflection controls:
The drafts that bar amount of deflection can drive the gradually little feeding sleeve of axially internal diameter to finely tune column tup by servo-controlled ball-screw changes;
4) the stressed correction of crackle:
Real-time detection also obtains bar stress point and closes on the arm of force signal between V-type groove tip, and it can be used as the feedback signal in blanking machine closed-loop control, real-time whole process corrects the Extended workflow-net of crackle, makes it be in a scope allowed, and realizes the flexible dynamic expansion of the most advanced and sophisticated circumferential crack of V-type groove.
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| CN201310234144.9A CN103286249B (en) | 2013-06-13 | 2013-06-13 | Variable-speed circumferential low-stress bending fatigue crack precise blanking machine and blanking method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1274799A (en) * | 1969-06-13 | 1972-05-17 | Zdarske Strojirny A Slevarny | Improvements in or relating to shearing machines |
| US3869948A (en) * | 1974-03-07 | 1975-03-11 | Aetna Standard Eng Co | Shear apparatus |
| CN2146324Y (en) * | 1992-09-16 | 1993-11-17 | 西安交通大学 | Revolving precision shearing machine |
| CN100467159C (en) * | 2007-06-05 | 2009-03-11 | 西安交通大学 | Unsymmetrical radial welding punched high performance precision blanking machine |
| CN101224479B (en) * | 2008-01-31 | 2010-07-28 | 西安交通大学 | Bar stock pneumatic radial impact blanking method with high-efficiency and precision |
| CN102218491B (en) * | 2011-03-09 | 2012-11-07 | 西安交通大学 | Rotary swaging forming equipment |
| CN102672067B (en) * | 2012-05-02 | 2014-03-12 | 西安交通大学 | Precise rotary rod pipe material blanking device with hydraulic controllable single piston |
| CN203292403U (en) * | 2013-06-13 | 2013-11-20 | 中国石油大学(华东) | Variable-speed circumferential low-stress bending fatigue fracture precision blanking machine |
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