CN105385842A - Residual stress releasing process device and stress releasing method for manufacturing process of large thin-walled components - Google Patents
Residual stress releasing process device and stress releasing method for manufacturing process of large thin-walled components Download PDFInfo
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- CN105385842A CN105385842A CN201510947457.8A CN201510947457A CN105385842A CN 105385842 A CN105385842 A CN 105385842A CN 201510947457 A CN201510947457 A CN 201510947457A CN 105385842 A CN105385842 A CN 105385842A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a residual stress releasing process device and a stress releasing method for the manufacturing process of large thin-walled components, belonging to the field of manufacturing of aerospace components. The residual stress releasing process device comprises a base platform, a mounting support, a support positioning block, a workpiece supporting positioning block, a clamping device and a magnetic vibration device and can release the residual stress in the large thin-walled components. The residual stress in the thin-walled components is released, so that the processing deformation is decreased, the appearance accuracy and the processing quality of the thin-walled components are improved, therefore the assembly accuracy and efficiency are improved, the quality inspection and assembly cycle of workpieces is shortened, and the assembly efficiency and the product quality are improved. The magnetic vibration device is controlled through an upper computer, so that the vibration frequency, the vibration direction and the size of vibration force of each vibration position can be adjusted. Moreover, a driving member and a driven member in the magnetic vibration device do not directly contact with each other and carry out conduction by relying on magnetic force, so that the residual stress releasing process device has the characteristics of stationary vibration and overload protection, and the damage on thin-walled components caused by excessive vibration is avoided.
Description
Technical field
The present invention relates to unrelieved stress intelligence release frock and stress relief method that aerospace component manufactures field, particularly a kind of aircraft large thin-wall part manufacturing processed.
Background technology
The pattern of aircraft wing component and assembly stress thereof directly affects reliability and the security of aircraft, therefore need to carry out strictly quality control to its processing and manufacturing process.Wherein, aircraft large thin-wall part can produce initial residual stress distribution field in the processes such as blank preparation, quenching, Milling Process, and produces initial deformation.After the wing thin-wall part and other parts with initial deformation are assembled, residual stress field will change and be retained in component, affect the military service performance of product, therefore, after component mechanical workout completes, reduced initial deformation and the assembly stress of component by the unrelieved stress of release component inside, be of value to the fatigue strength of aircraft and the raising in life-span.
At present, traditional hardware unrelieved stress method for releasing has natural aging, thermal treatment timeliness, knocks timeliness, oscillating aging etc.The unrelieved stress that natural aging reduces is little, and the production cycle is long, and greatly, not manageability, can not defect in Timeliness coverage component, is eliminated gradually for occupied ground.Thermal life processing requirement is strict, and soaking time is long, can cause greying, and component strength reduces.Heat-up rate is too fast, and much faster than heavy wall place of component thin-walled place heat-up rate in intensification, the temperature difference of component each several part sharply increases, and can cause additional temp stress.Lower the temperature improper, timeliness effect can be made greatly to reduce, even produce the thermal stress identical with former unrelieved stress, and remain in component, thus destroy acquired thermal life effect.Hammering timeliness is mainly used in welding residual stress dispose procedure, lack of standardization due to hammering, and size, the frequency of hammer force are uncontrollable, and therefore effect is difficult to ensure.Oscillating aging is under the effect of the external periodic force (exciting force) of vibrator, workpiece self is made to produce resonance, and then make its inner lattice distorted, produce slippage and restore balance, the unrelieved stress that release is inner, make its dimensional stabilizing, in above several stress relief method, effect is better.But the defect of traditional oscillating aging be vibration force, vibrational frequency and vibration direction non-adjustable, well cannot be applied to variable cross-section, Varying-thickness and the workpiece with hole characteristic.
Therefore, those skilled in the art is devoted to develop a kind of large thin-wall part manufacturing processed unrelieved stress release process device and method for releasing, eliminates the defect of traditional oscillating aging.
Summary of the invention
For defect of the prior art, the invention provides a kind of unrelieved stress intelligence release frock of aircraft large thin-wall part manufacturing processed, and to being realized the release to thin-wall part internal residual stress under the prerequisite not damaging thin-wall part structure by this frock; Realize the low-stress assembling of thin-wall part in transporation by plane.
The invention provides a kind of unrelieved stress intelligence release frock of aircraft large thin-wall part manufacturing processed, frock is characterised in that: comprise base platform, mounting bracket, support positioning block, workpiece support preset pieces, gripping unit, magnetic force vibrating device.Described base platform is rectangular configuration, for the installation of assembly on platform; Define the length direction of described base platform for longitudinal, width is that laterally the direction perpendicular to base platform is vertical; Described base platform is provided with horizontal and vertical support positioning block, and is vertically arranged with multiple gripping unit along platform.
Preferably, described support positioning block is installed on base platform, and can distinguish transversely and wiping action, the position of placing needed for mounting bracket adjusts, and plays and carries out sterically defined effect to mounting bracket.
Preferably, described horizontal and vertical preset pieces on base platform, base platform is designed with scale by magnetic-adsorption, and preset pieces in the enterprising line position adjustment of platform, can be opened magnetic switch when adjusting to correct position, make it be adsorbed on platform.
Preferably, after described mounting bracket completes location on base platform, be fixed on base platform, for the installation of thin-walled parts and magnetic force vibrating device.
Preferably, described workpiece support preset pieces is arranged on mounting bracket inner bottom surface, and magnetic-adsorption can be relied in bottom surface, preset pieces height can regulate, play the multi-point support to thin-walled parts and positioning action, and can auxiliary clamping device, workpiece is clamped.
Preferably, described gripping unit is fixed on base platform, longitudinally distributes multiple, is pressed from both sides form, for the clamping of thin-wall part in frock by stationary bearing, support and elbow.
Preferably, described stationary bearing is fixed on base platform, and support is connected with bearing by bolt and nut, and elbow folder is installed on support, is used for realizing the clamping to thin-walled parts edge.
Preferably, described magnetic force vibrating device is made up of motor, gear, tooth bar, clamp system.Clamp system is fixed on mounting bracket, motor can linearly move on clamp system, by clamp system, motor is fixed after adjusting installation site, gear is rotated by driven by motor, the continuous moving load of rack bar side end face one circulation is supplied in rotary course, be delivered on thin-wall part, thin-wall part just can be made to produce vibration.
Preferably, motor and gear are coaxially installed, driving gear rotates, gear and tooth bar are permanent magnet material and make, the side of tooth bar is adjacent to the thin-wall part back side, and gear and tooth bar are contactless, and the two magnetic force produced by permanent magnet material is interacted, because magneticaction forms thrust to tooth bar during pinion rotation, this thrust can present regular change along with the rotation of gear.Tooth on gear and tooth bar along with the rotation of gear have one constantly close to and away from process, this shows on interaction force, be exactly thrust the increasing close to continuous first along with tooth of gear mesh tooth bar, when reach capacity position time thrust also reach peak value, but when gear turns over this limit position, tooth on gear and tooth bar mutually away from, thrust suffered on tooth bar starts continuous reduction.Because the thin-wall part back side and tooth bar side are adjacent to; and rack position is fixed; therefore the thrust that is subject to of tooth bar can the almost break-even back side being applied to thin-wall part; such moving load just can make thin-wall part produce vibration; play the effect of release thin-wall part internal residual stress on the one hand; on the other hand due to rack-and-pinion noncontact, therefore this moving load can not produce large impact to thin-wall part, played the effect of overload protection.
Preferably, described tooth bar has double cog, tooth on two faces is mutually vertical, motor and gear is all provided with in the both sides of tooth bar, the different distributions of tooth bar two sides tooth, the vibration force be delivered to when causing magnetic force to conduct on thin-wall part has horizontal and vertical two kinds of directions, like this when reality uses, control the start and stop of two motors by upper computer in real time, thus control the direction of vibration at thin-wall part different positions place.
Preferably, the frequency of described magnetic force vibrating device to the size of the vibration force that thin-wall part produces and vibration can carry out regulation and control respectively by the rotating speed of the minor increment between adjusting gear tooth bar and motor, for different positions, the vibration force size and the vibrational frequency that reach optimal vibration effect are different, and these independences all can carrying out vibrating device relevant parameter for each vibration position by upper computer regulate.
Preferably, described magnetic force vibrating device is array distribution, forms vibration source respectively, carry out multiple spot vibration, advantageously in the release of thin-wall part unrelieved stress at the different positions that thin-wall part is horizontal and vertical.
Preferably, described magnetic force vibrating device, gripping unit are all provided with locking mechanism.
Preferably, the rack-and-pinion on described magnetic force vibrating device is contactless, relies on the interaction of magnetic force completely, thus has the stable characteristic of vibration.
Preferably, the size of described base platform and mounting bracket determined by the thin-wall part size of required placement.
Preferably, the number of described support positioning block, gripping unit and magnetic force vibrating device etc. is determined by the size of thin-wall part, and magnetic force vibrating device is array distribution.
Present invention also offers the stress relief method of the unrelieved stress intelligence release frock of application aircraft large thin-wall part manufacturing processed, unrelieved stress dispose procedure comprises the steps:
The first step: detect the unrelieved stress of described thin-wall part, obtains the initial residual stress of thin-wall part inside;
Second step: on mounting bracket, multipoint positioning and installation are carried out to thin-wall part, use gripping means grips workpiece after location and installation completes;
3rd step: tooth bar side is adjacent at the thin-wall part back side, the minimum clearance value of adjusting gear and tooth bar, magnetic force vibrating device is arranged on the corresponding position of mounting bracket, the rotating speed of motor is set by upper computer, press the starting switch of corresponding motor, driving gear rotates, it is made to produce the velocity pressure of peak steady to thin-wall part, thus by the releasing operation of vibration realizing to thin-wall part internal residual stress, minimum spacing between continuous adjustment rack-and-pinion and the rotating speed of motor, until reach optimal vibration amplitude and the frequency of release unrelieved stress, by controlling the start and stop of each tooth bar both sides motor, the change of thin-wall part at this position direction of vibration can be realized.
4th step: after the vibration operation completing for some time, take off thin-wall part, again internal residual stress detection is carried out to it, obtain detecting data and contrasting with the initial residual stress value that the first step obtains, if data do not have clear improvement, then represent that thin-wall part internal residual stress releasing effect is undesirable, return the 3rd step again to operate, still without considerable change after repeatedly vibration, then complete detection, output unacceptable product; If numerical value has had obvious reduction compared to the first step, then detect, illustrated that unrelieved stress is discharged, entered the 5th step;
5th step: export salable product.
Compared with prior art, the present invention has following beneficial effect:
The present invention reduces its machining deformation by release thin-wall part internal residual stress, improve form accuracy and the processing quality of thin-wall part, thus improve assembly precision and efficiency, shorten quality test and the assembly period of workpiece, save cost, improve efficiency of assembling and quality product; Adopting magnetic force vibrating device to complete release to thin-wall part internal residual stress, make use of magnetic force vibration driving link with Passive part without being rigidly connected, have vibration steadily, the characteristic of overload protection, damage to avoid the thin-wall part caused because vibration force is excessive; The present invention has simple to operate, can complete the clamping of thin-wall part in frock and the feature of internal residual stress dispose procedure thereof fast.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the perspective view of apparatus of the present invention;
Fig. 2 is mounting support structure schematic diagram of the present invention;
Fig. 3 is the whole structure figure after apparatus of the present invention remove mounting bracket;
Fig. 4 is gripping unit structural representation of the present invention;
Fig. 5 is magnetic force vibrator structure schematic diagram of the present invention;
Fig. 6 is thin-wall part of the present invention location and assembling schematic diagram;
Fig. 7 is the schema of unrelieved stress of the present invention release;
In figure: 1 is integrated tooling, 2 is base platform, and 3 is mounting bracket, 4 is support positioning block, and 5 is gripping unit, and 51 is bottom support bracket, 52 is swinging mounting, and 53 is web plate, and 54 is elbow folder, 6 is magnetic force vibrating device, and 61 is gripping unit, and 62 is motor, 63 is gear, 64 is tooth bar, and 7 is thin-walled parts-aircraft target ship, and 8 is workpiece support preset pieces.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Shown in Fig. 1 and Fig. 6, the base platform 2 of frock 1 is rectangular configuration, and the width of definition base platform 2 is the X-direction of Dikal coordinate system, and length direction is Y-direction, and the vertical direction of vertical feet platform 2 is Z-direction.X-direction is defined as transverse direction, and Y-direction is defined as longitudinal direction, and Z-direction is defined as vertically, the size of base platform 2 and mounting bracket 3 determined by the size of assembled thin-wall part 7, in the present embodiment, as shown in Figure 3; thin-wall part is about 1.2 meters, wide about 1 meter, base platform is designed to 2 × 1.6 meters.Base platform 2 is provided with support positioning block 4, the position of location and installation support 3 on base platform 2.Be vertically arranged with gripping unit 5, also be distributed with some magnetic force vibrating devices 6, concrete number is determined by the size of thin-wall part 7, in the present embodiment, gripping unit is provided with 5, be distributed in base platform 2 both sides longitudinally, magnetic force vibrating device 6 is distributed on mounting bracket 3, is the array distribution of 3 × 3, as shown in Figure 2.Support positioning block 4 is installed on base platform 2, and base platform 2 transversely with is longitudinally carved with scale, and preset pieces can carry out position adjustment according to scale marks.Workpiece support location fast 8 rely on magnetic-adsorptions in the bottom of mounting bracket 3, can horizontal and vertical adjustment be carried out, for location, support thin-wall part 7, and can auxiliary clamping device thin-wall part 7 is positioned after clamp operation.As shown in Figure 4, gripping unit 5 is fixed on base platform 2, longitudinally distribute multiple, press from both sides 54 by bottom support bracket 51, swinging mounting 52, web plate 53 and elbow to form, bottom support bracket 51 is fixed on base platform 2, and swinging mounting 52 is connected with bearing 51 by bolt and nut, fixing after support 51 being adjusted to vertical position, again elbow folder 54 is installed on web plate 53, for realizing the clamp operation to thin-wall part 7.As shown in Figure 5, magnetic force vibrating device 6 is made up of gripping unit 61, motor 62, gear 63, tooth bar 64.Gripping unit 61 is arranged on mounting bracket 3, motor 62 can linearly move on gripping unit 61, by gripping unit 61, motor 62 is fixed after adjusting installation site, gear 63 is by motor 62 driven rotary, the continuous moving load of one, tooth bar 64 side end face circulation is supplied in rotary course, be delivered on thin-wall part 7, just thin-wall part 7 can be made to produce vibration, tooth bar 64 has double cog, tooth on two faces is mutually vertical, motor 62 and gear 63 is all provided with in the both sides of tooth bar 65, the different distributions of tooth bar 64 two sides tooth, the vibration force be delivered to when causing magnetic force to conduct on thin-wall part 7 has vertical and longitudinal two kinds of directions, like this when reality uses, the start and stop of two motors 62 are controlled in real time by upper computer, thus control the direction of vibration at thin-wall part 7 different positions place.The amplitude that magnetic force vibrating device 6 vibrates and frequency can control respectively by the rotating speed of the minor increment between adjusting gear 63 and tooth bar 64 and motor 62.
See Fig. 7, frock 1 carries out the process of unrelieved stress release to aircraft large thin-wall part 7 as follows:
The first step: the unrelieved stress of described thin-wall part 7 is detected, obtains the initial residual stress of its inside;
Second step: be placed in by thin-wall part 7 on the workpiece support preset pieces 8 of mounting bracket 3, after positioning, uses gripping unit 5 to clamp thin-wall part 7 to it;
3rd step: tooth bar 64 is adjacent at thin-wall part 7 back side, the minimum clearance value of adjustment magnetic force vibrating device middle gear 63 and tooth bar 64, magnetic force vibrating device 6 is arranged on the corresponding position of mounting bracket 3, set the rotating speed of motor 62, press starting switch, driving gear 63 rotates, magnetic force conduction is relied on to make tooth bar 64 side produce the velocity pressure of peak steady to thin-wall part 7, thus the releasing operation realized thin-wall part 7 internal residual stress, minimum spacing between continuous adjustment gear 63 and tooth bar 64 and the rotating speed of motor 62, until reach optimal vibration amplitude and the frequency of release unrelieved stress.By the start and stop of PC control motor 62-1 and 62-2, the change of direction of vibration can be realized, during independent starter motor 62-1, generation be vertical motion, during independent starter motor 62-2, generation be longitudinal vibration, when starting simultaneously, produce direction vibration.
4th step: after the vibration operation completing for some time, take off thin-wall part 7, again internal residual stress detection is carried out to it, obtain detecting data and contrasting with the initial residual stress value that the first step obtains, if data do not have clear improvement, then represent that thin-wall part 7 internal residual stress releasing effect is undesirable, return the 3rd step again to operate, still without considerable change after repeatedly vibration, then complete detection, output unacceptable product; If numerical value has had obvious reduction compared to the first step, then detect, illustrated that unrelieved stress is discharged, entered the 5th step;
5th step: export salable product.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. the unrelieved stress release process device of a large thin-wall part manufacturing processed, it is characterized in that, comprise base platform, mounting bracket, support positioning block, workpiece support preset pieces, gripping unit, magnetic force vibrating device, described base platform is rectangular configuration, for the installation of assembly on platform; The length direction of described base platform is longitudinally, and width is that laterally the direction perpendicular to base platform is vertical; Described base platform is provided with horizontal and vertical support positioning block, and is vertically arranged with multiple gripping unit along platform; Described magnetic force vibrating device is made up of motor, gear, tooth bar, clamp system; Clamp system is fixed on mounting bracket, motor can linearly move on clamp system, motor is fixed by clamp system behind installation site by adjustment, gear is rotated by driven by motor, the continuous moving load of rack bar side end face one circulation is supplied in rotary course, be delivered on thin-wall part, thin-wall part just can be made to produce vibration; Motor and gear are coaxially installed, driving gear rotates, gear and tooth bar are permanent magnet material and make, the side of tooth bar is adjacent to the thin-wall part back side, gear and tooth bar are contactless, the two magnetic force produced by permanent magnet material is interacted, and because magneticaction forms thrust to tooth bar during pinion rotation, this thrust can present regular change along with the rotation of gear; The thrust that tooth on gear and tooth bar is configured to gear mesh tooth bar along with the rotation of gear first along with tooth close to constantly increasing, when reach capacity position time thrust also reach peak value, but when gear turns over this limit position, tooth on gear and tooth bar mutually away from, thrust suffered on tooth bar starts continuous reduction.
2. the unrelieved stress release process device of large thin-wall part manufacturing processed as claimed in claim 1, it is characterized in that, described tooth bar has double cog, tooth on two faces is mutually vertical, all be provided with motor and gear in the both sides of tooth bar, the different distributions of tooth bar two sides tooth, the vibration force be delivered to when causing magnetic force to conduct on thin-wall part has horizontal and vertical two kinds of directions, control the start and stop of two motors by upper computer in real time, thus control the direction of vibration at thin-wall part different positions place.
3. the unrelieved stress release process device of large thin-wall part manufacturing processed as claimed in claim 1, it is characterized in that, the frequency of described magnetic force vibrating device to the size of the vibration force that thin-wall part produces and vibration can carry out regulation and control respectively by the rotating speed of the minor increment between adjusting gear tooth bar and motor.
4. the unrelieved stress release process device of large thin-wall part manufacturing processed as claimed in claim 1, it is characterized in that, gear on described magnetic force vibrating device and acting as between tooth bar contactless, rely on the interaction of magnetic force completely, thus there is the stable characteristic of vibration.
5. the unrelieved stress release process device of large thin-wall part manufacturing processed as claimed in claim 1, is characterized in that, the independence that described magnetic force vibrating device can carry out vibrating device relevant parameter for each vibration position by upper computer regulates.
6. the unrelieved stress release process device of the large thin-wall part manufacturing processed according to any one of claim 1 to 5, is characterized in that, the size of described base platform and mounting bracket determined by the thin-wall part size of required placement.
7. the unrelieved stress release process device of the large thin-wall part manufacturing processed according to any one of claim 1 to 5, is characterized in that, the number of described support positioning block, gripping unit and magnetic force vibrating device etc. is determined by the size of thin-wall part.
8. the unrelieved stress release process device of large thin-wall part manufacturing processed as claimed in claim 7, is characterized in that, described magnetic force vibrating device is array distribution.
9. the unrelieved stress release process device of large thin-wall part manufacturing processed as claimed in claim 1, it is characterized in that, described long girder material is 7 line aluminium alloys.
10. an application large thin-wall part manufacturing processed unrelieved stress releasing device as claimed in any one of claims 1-9 wherein release strain method, is characterized in that, described in comprise the steps:
The first step: detect the unrelieved stress of described thin-wall part, obtains the initial residual stress of thin-wall part inside;
Second step: on mounting bracket, multipoint positioning and installation are carried out to thin-wall part, use gripping means grips workpiece after location and installation completes;
3rd step: tooth bar side is adjacent at the thin-wall part back side, the minimum clearance value of adjusting gear and tooth bar, magnetic force vibrating device is arranged on the corresponding position of mounting bracket, the rotating speed of motor is set by upper computer, press the starting switch of corresponding motor, driving gear rotates, it is made to produce the velocity pressure of peak steady to thin-wall part, thus by the releasing operation of vibration realizing to thin-wall part internal residual stress, minimum spacing between continuous adjustment rack-and-pinion and the rotating speed of motor, until reach optimal vibration amplitude and the frequency of release unrelieved stress, by controlling the start and stop of each tooth bar both sides motor, the change of thin-wall part at this position direction of vibration can be realized,
4th step: after the vibration operation completing for some time, take off thin-wall part, again internal residual stress detection is carried out to it, obtain detecting data and contrasting with the initial residual stress value that the first step obtains, if data do not have clear improvement, then represent that thin-wall part internal residual stress releasing effect is undesirable, return the 3rd step again to operate, still without considerable change after repeatedly vibration, then complete detection, output unacceptable product; If numerical value has had obvious reduction compared to the first step, then detect, illustrated that unrelieved stress is discharged, entered the 5th step;
5th step: export salable product.
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| CN201510947457.8A CN105385842B (en) | 2015-12-16 | 2015-12-16 | Large thin-wall part manufacturing process residual stress release process device and method for releasing |
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| CN201510947457.8A CN105385842B (en) | 2015-12-16 | 2015-12-16 | Large thin-wall part manufacturing process residual stress release process device and method for releasing |
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| CN105385842A true CN105385842A (en) | 2016-03-09 |
| CN105385842B CN105385842B (en) | 2017-05-31 |
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| CN108150631A (en) * | 2018-01-02 | 2018-06-12 | 天津工业大学 | A kind of military service for Aeronautical Gears is lengthened the life active gain system |
| CN112322888A (en) * | 2020-09-29 | 2021-02-05 | 沈阳工业大学 | Online reduction method and device for additive composite manufacturing stress based on symmetric high-frequency vibration |
| CN113564330A (en) * | 2021-07-15 | 2021-10-29 | 马鞍山市恒利达机械刀片有限公司 | High-toughness internal stress eliminating device for machining circular serrated knife and implementation method thereof |
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| Publication number | Publication date |
|---|---|
| CN105385842B (en) | 2017-05-31 |
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