CN115747784A - Cold spraying additive interface strength improving method and shaft part lengthening method - Google Patents
Cold spraying additive interface strength improving method and shaft part lengthening method Download PDFInfo
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- CN115747784A CN115747784A CN202211240701.3A CN202211240701A CN115747784A CN 115747784 A CN115747784 A CN 115747784A CN 202211240701 A CN202211240701 A CN 202211240701A CN 115747784 A CN115747784 A CN 115747784A
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- 239000000654 additive Substances 0.000 title claims abstract description 69
- 230000000996 additive effect Effects 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000010288 cold spraying Methods 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000003754 machining Methods 0.000 claims description 30
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 7
- 238000010008 shearing Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007788 roughening Methods 0.000 description 4
- 238000005488 sandblasting Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000007514 turning Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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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
- Y02P10/25—Process efficiency
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a cold spraying additive interface strength improving method and a shaft part lengthening method, which comprise the following steps: the method comprises the following steps of carrying out primary processing on a material increase interface of a part to be processed to increase the area of the material increase interface; performing secondary processing on the additive interface to improve the roughness of the additive interface; and carrying out cold spraying on the additive material interface after secondary processing. Because the vibration material disk interface mainly used transmits load, can receive the shearing force, through carrying out secondary design to vibration material disk interface, increased vibration material disk interface's area, promoted vibration material disk interface's roughness, can effectively promote the bearing capacity of interface, and then promote interface strength.
Description
Technical Field
The invention relates to the technical field of cold spraying, in particular to a cold spraying additive interface strength improving method and a shaft part lengthening method.
Background
At present, the cold spraying technology has the characteristics of unlimited coating thickness, high material increase efficiency and the like, has the potential of being widely applied in the fields of aerospace, steel, petroleum, oceans, military and the like, is gradually developed into a rapid material increase manufacturing technology at present, and is concerned by the industry. The interface is a combination area between the matrix and the reinforcement, the interface strength of the coating is one of important indexes for evaluating the quality of the coating, and the service safety and the service life of the equipment parts are directly influenced by the strength of the interface strength.
In the related art, the method for improving the interface bonding strength is to treat a formed coating by a remelting technology, but the method has some defects, residual stress is induced by uneven heat distribution during remelting, cracks are generated in the coating, and the coating can be peeled off seriously; part of the materials are sensitive to high temperature, and parts are thermally damaged due to high-temperature remelting, so that the structure is large and the performance is reduced.
Disclosure of Invention
The embodiment of the invention provides a cold spraying additive interface strength improving method and a shaft part lengthening method, which aim to solve the problems that cracks are generated in a coating layer and even peeled off, and the part is damaged by heat to cause a coarse structure and performance reduction in the related art.
In a first aspect, a method for improving strength of a cold spraying additive interface is provided, which includes the following steps: the method comprises the following steps of carrying out primary processing on a material increase interface of a part to be processed to increase the area of the material increase interface; performing secondary processing on the additive material interface to improve the roughness of the additive material interface; and carrying out cold spraying on the additive interface after secondary processing.
In some embodiments, the machining the additive interface once includes: by changing the angle of the additive interface, the area of the additive interface is increased.
In some embodiments, before the processing the additive interface once, the method further includes: and determining the angle of the additive interface to be changed according to the stress characteristic of the part to be processed.
In some embodiments, the secondary machining of the additive interface comprises: and machining grains on the additive material interface, wherein the extending direction of the grains is perpendicular to the axis of the part to be machined.
In some embodiments, before the cold spraying the additively machined interface after the secondary machining, further comprising: and adjusting the cold spraying angle to enable the cold spraying jet flow direction to be parallel to the extending direction of the grains.
In some embodiments, after the cold spraying the additive interface after the secondary machining, further comprising: and integrally processing the outer part of the coating, wherein the processing direction is parallel to the stress direction of the part to be processed.
In a second aspect, a method for lengthening a shaft part is provided, which includes: the end of the part to be processed is processed for one time, and a conical surface is formed, so that the area of the additive material interface is increased. Carrying out secondary processing on the conical surface to improve the roughness of the conical surface; and carrying out cold spraying on the conical surface after the secondary processing.
In some embodiments, the secondary machining of the tapered surface comprises: and machining threads on the conical surface, wherein the extension direction of the threads is perpendicular to the axis of the part to be machined.
In some embodiments, before the cold spraying the conical surface after the secondary machining, the method further includes: and adjusting the cold spraying angle to enable the jet flow direction of cold spraying to be parallel to the extension direction of the threads.
In some embodiments, the outer portion of the coating is integrally machined with reference to an original outer cylindrical surface of the part to be machined, and the machining direction is parallel to the stress direction of the part to be machined.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a cold spraying additive interface strength improving method and a shaft part lengthening method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for improving strength of a cold spray additive interface according to the present invention.
FIG. 2 is a schematic structural diagram of a material increase interface of the shaft part lengthening method after one-time processing;
FIG. 3 is a schematic structural diagram of the shaft part lengthening method after the secondary machining of the additive interface;
FIG. 4 is a schematic structural diagram of the shaft part lengthening method after cold spraying of the part to be processed;
fig. 5 is a schematic structural diagram of the shaft part lengthening method after the parts to be processed are subjected to complementary processing.
Reference numbers in the figures:
1. an additive interface after primary processing; 2. a material increase interface after secondary processing; 3. cold spraying the part to be processed; 4. and supplementing the machined part to be machined.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the invention provides a cold spraying additive interface strength improving method and a shaft part lengthening method, which can solve the problems of large structure and performance reduction caused by heat damage of parts due to cracks and even peeling generated in coatings in the related technology.
Referring to fig. 1 to 5, a method for improving strength of a cold spray additive interface according to an embodiment of the present invention may include the following steps:
s1, machining an additive material interface of a part to be machined for one time to increase the area of the additive material interface.
And S2, carrying out secondary processing on the additive interface to improve the roughness of the additive interface.
And S3, performing cold spraying on the additive material interface after the secondary processing.
In this embodiment, through carrying out the secondary design to the vibration material disk interface, increased vibration material disk interface's area, promoted vibration material disk interface's roughness, can effectively promote the bearing capacity at interface, and then promoted interface strength, carry out cold spraying on vibration material disk interface after the processing, promoted coating quality, played the life who prolongs spare part.
Referring to fig. 2, in some alternative embodiments, the processing the additive interface may include: in this embodiment, the area of the additive interface is increased by changing the angle of the additive interface, for example, the to-be-processed part is a flat plate, the additive interface may be processed into an inclined surface, or the to-be-processed part is a cylinder, the additive interface may be processed into a cone, and the processing is convenient. In other embodiments, the area of the additive interface may be increased in other ways, and the area of the additive interface may also be increased by changing the shape of the additive interface, for example, changing a plane into a curved surface or a polygon.
Referring to fig. 2, in some embodiments, before the performing of the one-time processing on the additive material interface, the method may further include: in the embodiment, the machining angle of the additive material interface can be larger according to the stress characteristics of the part to be machined, such as better fatigue resistance and better bending resistance, so that the area of the additive material interface is increased on the basis of ensuring the strength of the part to be machined.
Referring to fig. 3, in some alternative embodiments, the secondary machining of the additive interface may include: in the embodiment, according to the stress direction of the processed part, roughening and roughening treatment is carried out on the interface by adopting turning, drawing, scraping and other modes, the grains are perpendicular to or close to the stress direction, so that interface pollution caused by sand blasting can be avoided, the coating is tightly combined with the base material, and the load bearing capacity of the interface is further enhanced; if the part to be processed is cylindrical and mainly subjected to axial tensile load, the extending direction of the grains is perpendicular to the axis of the part to be processed, and if the part to be processed is in other shapes, the extending direction of the grains can also be in other directions.
Referring to fig. 3, in some embodiments, before the cold spraying the additively machined interface after the secondary machining, the method may further include: the cold spraying angle is adjusted to enable the jet flow direction of cold spraying to be parallel to the extending direction of the grains, in the embodiment, the cold spraying angle is parallel to the extending direction of the grains, and is also parallel to the included angle bisector of the grains, so that the cold spraying jet flow can penetrate the bottom of the grains directly to form a non-porous combination, the porosity is effectively reduced, and the interface strength is improved.
Referring to fig. 4 and 5, in some embodiments, after the cold spraying the additive interface after the secondary machining, the cold spraying may further include: the outer part of the coating is integrally processed, the processing direction is parallel to the stress direction of the part to be processed, in the embodiment, the integrity and the size precision of the surface are controlled through supplementary processing, the fatigue characteristic of the part is obviously improved while the function of the part is ensured, and the stress concentration can be avoided to cause early damage when the processing direction is consistent with the stress direction of the part to be processed.
Specifically, the method for improving the strength of the cold spraying additive interface provided by the embodiment of the invention comprises four steps of designing an interface macroscopic shape, designing and processing an interface microscopic shape, adjusting and optimizing parameters in a cold spraying additive process, and realizing control of the final size and the surface integrity of a part by supplementing processing.
1. Interface macroscopic shape design
According to the stress characteristics of the part, the interface angle is properly changed, and the interface area is increased.
2. Interface micro-topography design and processing
According to the stress direction of the part, roughening and roughening treatment is carried out on the interface by adopting turning, drawing, scraping and other modes, the grain is vertical or nearly vertical to the stress direction, and the roughness is controlled to Ra5-12um.
3. Cold spraying additive process parameter optimization adjustment
Adjusting the cold spraying additive spraying angle, enabling the jet flow direction to be parallel to the included angle bisector of the micro-morphology groove, carrying out cold spraying additive, ensuring the interface to be compact and reducing the interface pores.
4. Additional machining to achieve part final dimension and surface integrity control
After the spraying and material increasing are finished, the parts are integrally processed, the size and the surface integrity of the parts are ensured, no over-cut or scratch is visible visually, the processing lines are consistent with the stress direction as much as possible, and the phenomenon that the processing lines cause stress concentration and early fracture is avoided.
Referring to fig. 2 to 5, a method for lengthening a shaft part according to an embodiment of the present invention may include:
s1, processing the end of a part to be processed at one time to form a conical surface, so that the area of a material increase interface is increased, specifically, the shaft part is subjected to torsion and axial tensile load, pretreatment is carried out before spraying, the end of the shaft to be lengthened is made into a conical shape, and the bonding area of a coating and a base material is increased.
And S2, carrying out secondary processing on the conical surface to improve the roughness of the conical surface, specifically, considering the processing manufacturability, roughly turning threads on the conical surface of the base material to realize the roughness required by the interface of the base material and the coating.
And S3, performing cold spraying on the conical surface after the secondary machining, and specifically, finishing spraying operation on the base material to manufacture a workpiece.
Referring to fig. 3, in some embodiments, the secondary machining of the tapered surface may include: in this embodiment, the shaft part is subjected to torsion and axial tensile load, the main stress direction is axial, the torsion is an auxiliary load, and the thread machining is vertical to the main load direction, so that the interface bearing capacity can be further improved.
Referring to fig. 3, in some embodiments, before the cold spraying the conical surface after the secondary machining, the method may further include: the cold spraying angle is adjusted, the jet flow direction of cold spraying is parallel to the extending direction of the threads, in the embodiment, the spraying angle is parallel to the extending direction of the threads, and the jet flow can be directly sprayed to the bottom of the thread groove, so that the interface is guaranteed to be compact, and the interface pores are reduced.
Referring to fig. 4 and 5, in some embodiments, the outer portion of the coating is integrally processed with reference to the original outer cylindrical surface of the part to be processed, and the processing direction is parallel to the stress direction of the part to be processed, in this embodiment, the post-spraying supplementary processing uses the original outer cylindrical surface of the long shaft as reference to process the cold spraying additive body, the surface roughness value is not higher than ra1.6, and the size of the part is ensured to meet the design requirement.
The principle of the cold spraying additive interface strength improving method and the shaft part connecting method provided by the embodiment of the invention is as follows:
according to the load mode of the part, the interface of the additive body and the base material is designed, the area of the interface is increased, and the load bearing capacity of the interface can be effectively enhanced; the interface microscopic morphology is processed in a non-sand blasting mode, the coarsening of the substrate interface is realized, the interface pollution caused by sand blasting is avoided, the coating is tightly combined with the substrate, the processing lines are vertical to the load direction, and the interface bearing capacity can be further improved; the macro spraying angle parameter is associated with the micro roughness morphology, the spraying angle is parallel to the bisector of the included angle of the interface micro groove, the sand blasting coarsening random morphology is optimized, the interference and the impurity pollution are shielded, the cold spraying jet flow can directly irradiate the bottom of the micro groove, and the purposes of forming hole-free combination by higher strength and smaller porosity are achieved; the surface integrity and the dimensional accuracy are controlled by supplementary machining, the function of the part is ensured, and the fatigue characteristic of the part is obviously improved.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A cold spraying additive interface strength improving method is characterized by comprising the following steps:
the method comprises the following steps of carrying out primary processing on a material increase interface of a part to be processed to increase the area of the material increase interface;
performing secondary processing on the additive material interface to improve the roughness of the additive material interface;
and carrying out cold spraying on the additive material interface after secondary processing.
2. The method of increasing strength of a cold spray additive interface of claim 1, wherein the machining the additive interface once comprises:
increasing the area of the additive interface by changing the angle of the additive interface.
3. The method of increasing strength of a cold spray additive interface of claim 2, further comprising, prior to the machining the additive interface once:
and determining the angle of the additive interface to be changed according to the stress characteristic of the part to be processed.
4. The method of increasing strength of a cold spray additive interface of claim 1, wherein the secondary machining of the additive interface comprises:
and machining grains on the additive material interface, wherein the extending direction of the grains is perpendicular to the axis of the part to be machined.
5. The method for improving strength of a cold spray additive interface of claim 4, wherein prior to cold spraying the additively machined interface after the secondary machining, further comprising:
and adjusting the cold spraying angle to enable the cold spraying jet flow direction to be parallel to the extending direction of the grains.
6. The method for improving strength of a cold spray additive interface of claim 1, further comprising, after the cold spraying the additized interface after the secondary machining:
and integrally processing the outer part of the coating, wherein the processing direction is parallel to the stress direction of the part to be processed.
7. A shaft part lengthening method is characterized by comprising the following steps:
the end of the part to be machined is machined for one time, and a conical surface is formed, so that the area of a material increase interface is increased;
performing secondary processing on the conical surface to improve the roughness of the conical surface;
and carrying out cold spraying on the conical surface after the secondary processing.
8. The method of claim 7, wherein the secondary machining of the tapered surfaces comprises:
and machining threads on the conical surface, wherein the extending direction of the threads is perpendicular to the axis of the part to be machined.
9. The method for lengthening shaft parts according to claim 8, further comprising, before said cold spraying of said tapered surface after said secondary machining:
and adjusting the cold spraying angle to enable the jet flow direction of cold spraying to be parallel to the extension direction of the threads.
10. A method of lengthening shaft parts according to claim 7, wherein:
and integrally processing the outer part of the coating by taking the original outer cylindrical surface of the part to be processed as a reference, wherein the processing direction is parallel to the stress direction of the part to be processed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211240701.3A CN115747784A (en) | 2022-10-11 | 2022-10-11 | Cold spraying additive interface strength improving method and shaft part lengthening method |
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| CN202211240701.3A CN115747784A (en) | 2022-10-11 | 2022-10-11 | Cold spraying additive interface strength improving method and shaft part lengthening method |
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