CN103343184B - Notched-bar microstructure-crack initiation method used for chipless fine blanking - Google Patents
Notched-bar microstructure-crack initiation method used for chipless fine blanking Download PDFInfo
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Abstract
The invention provides a notched-bar microstructure-crack initiation method used for a chipless fine blanking. The method comprises putting a whole metal bar prefabricated with an annular "V"-shaped notch into a resistance heating furnace, setting a heating rate of the resistance heating furnace, energizing the resistance heating furnace, heating the metal bar to 300-1000 DEG C, stopping heating, insulating; moving the metal bar from the resistance heating furnace to a bar chilling device, opening power of the bar chilling device so that the metal bar rotates in the bar chilling device, adjusting a flow rate of cooling water, opening power of the cooling water, and striking with flow the heated metal bar so as to chill the metal bar to a water temperature. According to the invention, uniformly distributed multi-source microstructure crack groups can be prefabricated for the chipless fine blanking technology of the metal bars with different materials, so that dynamic cracks can be relatively quickly enter an expansion phase in a subsequent blanking process, thereby shortening a whole blanking time and improving an overall blanking efficiency.
Description
Technical field
The invention belongs to chipless bar precise blanking technical field, be specifically related to a kind of chipless precise blanking breach bar microstructure crack initiation method.
Background technology
Round bar is one of the most basic blank form, application widely, such as various shaft parts, its precise blanking operation is as the first operation in large machine production process, also be the mark that part processing starts, its fracture efficiency and cross section quality will directly affect numerous and diverse degree and the tooling cost of subsequent handling.The chipless material-saving that the novel chipless low-stress bar precise blanking technology that under the notch stress strain concentrating effect utilizing notch root particular geometry to produce, heavily stressed three axle degree, material fragility taxis and the new development of Dynamic Crack Propagation method are got up makes the bar blanking process of metal achieve truly is produced.But no matter novel precise blanking system is that mechanical power drives or hydraulic power drives, and its blanking efficiency still can not meet needed for production in enormous quantities, and its critical bottleneck is running crack technology.
As everyone knows, the complete life-span of running crack comprises the initiating life of microstructure crackle and the expansion life-span of macrocrack, the germinating process of microstructure crackle serves vital effect in whole crack propagation process, its initiating life can account for 80% of the whole life-span at most, therefore, the microstructure collective cracks of polyphyly germinating is more conducive to the connection of later stage microstructure crackle and the expansion of macrocrack, thus greatly shortens the life-span of Dynamic Crack.For novel chipless precise blanking technology, the germinating of microstructure crackle is mainly derived from the loading of load, different loadings is also different with number for the distribution of the microstructure collective cracks produced, but be subject to the restriction of load loading form, can only realize multipoint mode load and can not realize face loading truly, bar notch root can only produce microstructure formation of crack few in number.Therefore, in order to improve the fracture efficiency of chipless precise blanking, need to shift to an earlier date prefabricated equally distributed microstructure collective cracks before precise blanking operation.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of chipless precise blanking breach bar microstructure crack initiation method, breach bar can be realized in the regional area of its notch root, germinate the more uniform polyphyly microstructure collective cracks of distribution, eliminate the germinating stage of the microstructure crackle of follow-up blanking procedure, improve the blanking efficiency of whole chipless precise blanking technique.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of chipless precise blanking breach bar microstructure crack initiation method, concrete steps are:
Step one, performance according to different metal bar, be positioned in resistance heading furnace by the metal bar material entirety being prefabricated with annular " V " type breach;
Step 2, unlike material according to metal bar material, after setting heating rate 5-30 DEG C/s of resistance heading furnace, resistance heading furnace energising starts to heat metal bar material;
Step 3, after the Heating temperature of metal bar material reaches 300-1000 DEG C, heating is stopped also carrying out insulation 2-5 minute to metal bar material;
Step 4, metal bar material moved to bar chilling device from resistance heading furnace and opens bar chilling device power supply, metal bar material is rotated in bar chilling device;
Step 5, regulate after water coolant flow velocity 3-8m/s and open cooling water power source, impact current Quench is carried out to water flow temperature to heated metal bar material.
Described bar chilling device comprises water pipe 1, water pipe 1 adopts fixed installation mode, water pipe 1 inside is water coolant 7, the flow velocity of water coolant 7 presets, water pipe 1 is distributed with the plural shower nozzle 2 corresponding with " V " type breach 4 position, metal bar material 3 is positioned at below water pipe 1, be in same vertical plane c with water pipe 1, metal bar material 3 is supported with active roller 5 by the passive roller 6 be positioned at below it, the central shaft of passive roller 6 is positioned at same plane d with the central shaft b of active roller 5, initiatively roller 5 is driven by motor, by the rotation of active roller 5, metal bar material 3 is at the uniform velocity rotated around its symmetry axis a, its circular frequency is 30-120 rev/min.
The present invention adopts resistance heading furnace to carry out homogeneous heating to metal bar material, and utilize the active rotation mode of bar chilling device to make metal charge reach even Quench in whole chilling process, it can be the chipless precise blanking technique prefabricated equally distributed polyphyly microstructure collective cracks in advance of different metals bar, make the Dynamic Crack in follow-up blanking procedure can enter extension phase faster, shorten the whole blanking time, improve Whole blanking efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of breach bar microstructure crack initiation method.
Fig. 2 is the front view of breach bar microstructure crack initiation method refrigerating unit.
Fig. 3 is the left view of breach bar microstructure crack initiation method refrigerating unit.
Fig. 4 is annular " V " type notch root microstructure crack initiation schematic diagram.
Fig. 5 is that commercial finite element software ABAQUS emulates the microstructure crack initiation schematic diagram provided.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
With reference to Fig. 1, a kind of chipless precise blanking breach bar microstructure crack initiation method, concrete steps are:
Step one, performance according to different metal bar 3, be positioned in resistance heading furnace by metal bar material 3 entirety being prefabricated with annular " V " type breach;
Step 2, unlike material according to metal bar material 3, after setting heating rate 5-30 DEG C/s of resistance heading furnace, resistance heading furnace energising starts to heat metal bar material 3;
Step 3, after the Heating temperature of metal bar material 3 reaches 300-1000 DEG C, heating is stopped also carrying out insulation 3 minutes to metal bar material 3;
Step 4, metal bar material 3 moved to bar chilling device from resistance heading furnace and opens bar chilling device power supply, metal bar material 3 is rotated in bar chilling device;
Step 5, regulate water coolant speed 3-8m/s after open cooling water power source, impact current Quench is carried out to water flow temperature to heated metal bar material 3.
With reference to Fig. 2 and Fig. 3, described bar chilling device comprises water pipe 1, water pipe 1 adopts fixed installation mode, water pipe 1 inside is water coolant 7, the flow velocity of water coolant 7 presets, water pipe 1 is distributed with the plural shower nozzle 2 corresponding with " V " type breach 4 position, metal bar material 3 is positioned at below water pipe 1, be in same vertical plane c with water pipe 1, metal bar material 3 is supported with active roller 5 by the passive roller 6 be positioned at below it, the central shaft of passive roller 6 is positioned at same plane d with the central shaft b of active roller 5, initiatively roller 5 is driven by motor, by the rotation of active roller 5, metal bar material 3 is at the uniform velocity rotated around its symmetry axis a, its circular frequency is 30-120 rev/min.
With reference to Fig. 4 and Fig. 5, according to the performance of metal bar material 3 in step 5, the impact current that water coolant flow velocity is 3-8m/s are set, so arrange, microstructure crackle 8 will be produced at " V " type breach 4 root.
Claims (1)
1. a chipless precise blanking breach bar microstructure crack initiation method, it is characterized in that, concrete steps are:
Step one, performance according to different metal bar, be positioned in resistance heading furnace by the metal bar material entirety being prefabricated with annular " V " type breach;
Step 2, unlike material according to metal bar material, after setting heating rate 5-30 DEG C/s of resistance heading furnace, resistance heading furnace energising starts to heat metal bar material;
Step 3, after the Heating temperature of metal bar material reaches 300-1000 DEG C, heating is stopped also carrying out insulation 2-5 minute to metal bar material;
Step 4, metal bar material moved to bar chilling device from resistance heading furnace and opens bar chilling device power supply, metal bar material is rotated in bar chilling device;
Step 5, regulate after water coolant flow velocity 3-8m/s and open cooling water power source, impact current Quench is carried out to water flow temperature to heated metal bar material,
Described bar chilling device comprises water pipe (1), water pipe (1) adopts fixed installation mode, water pipe (1) inside is water coolant (7), water pipe (1) is distributed with the plural shower nozzle (2) corresponding with " V " type breach (4) position, metal bar material (3) is positioned at water pipe (1) below, be in same vertical plane c with water pipe (1), metal bar material (3) by be positioned at passive roller (6) below it and initiatively roller (5) support, the central shaft of passive roller (6) is positioned at same plane d with the central shaft b of active roller (5), initiatively roller (5) is driven by motor, by the rotation of active roller (5), metal bar material (3) is at the uniform velocity rotated around its symmetry axis a, its circular frequency is 30-120 rev/min.
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| CN201310196340.1A CN103343184B (en) | 2013-05-23 | 2013-05-23 | Notched-bar microstructure-crack initiation method used for chipless fine blanking |
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| CN201310196340.1A CN103343184B (en) | 2013-05-23 | 2013-05-23 | Notched-bar microstructure-crack initiation method used for chipless fine blanking |
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| CN103343184B true CN103343184B (en) | 2015-02-25 |
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| CN104388658A (en) * | 2014-10-31 | 2015-03-04 | 西安交通大学 | Notched pipe material micro-crack batch initiating device and method for fine blanking |
| CN104357630B (en) * | 2014-10-31 | 2016-06-29 | 西安交通大学 | Ideal crack device and method is prepared in the bar Electromagnetic Heating with cannelure and cooling |
| CN106808174B (en) * | 2016-04-05 | 2019-01-25 | 中国石油大学(华东) | A kind of low stress efficient centrifugal bar material baiting machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102706767A (en) * | 2012-05-29 | 2012-10-03 | 中国石油大学(华东) | Push-pull type multi-groove dual side box thermal stress prefabricated microcrack cooling equipment |
| 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 |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706767A (en) * | 2012-05-29 | 2012-10-03 | 中国石油大学(华东) | Push-pull type multi-groove dual side box thermal stress prefabricated microcrack cooling equipment |
| 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 |
Non-Patent Citations (1)
| Title |
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| 热应力预制裂纹技术在低应力精密下料中的实验研究;张立军等;《现代制造技术与装备》;20101231(第5期);第4-5、8页 * |
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