CN102211221B - Method for controlling formation of burr in micromachining by low melting point alloy - Google Patents
Method for controlling formation of burr in micromachining by low melting point alloy Download PDFInfo
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- CN102211221B CN102211221B CN201110106928A CN201110106928A CN102211221B CN 102211221 B CN102211221 B CN 102211221B CN 201110106928 A CN201110106928 A CN 201110106928A CN 201110106928 A CN201110106928 A CN 201110106928A CN 102211221 B CN102211221 B CN 102211221B
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Abstract
The invention relates to a method for controlling formation of burr in micromachining by low melting point alloy. On the basis of intensive studying formation mechanism of burr in micromachining, the cutting procedure of edge parts is as stable as the cutting procedure of non-edge regions via eliminating the negative cutting region of processed parts. The method in the invention primarily comprises the following five steps of: selecting an alloy, heating up to melt, cooling to solidify, milling and removing the alloy. In the invention, deformation and unstability in micromachining can be effectively reduced; the formation of burrs is reduced; the surface precision of products is improved; and the method has the advantages of no pollution, is easy to apply, easy to remove and the like.
Description
Technical field
The present invention relates to a kind of low-melting alloy that utilizes and control the method that burr produces in the microfabrication, belong to the technical field that the control burr produces in the microfabrication.
Background technology
The especially little Milling Process technology of Micrometer-Nanometer Processing Technology is that micromachine is made the very important forming technique in field, and is closely bound up with national economic development, scientific and technological progress and national defense construction, has very big industrialization prospect.Little milling (Micro-milling) technology is a kind of New Processing of processing micro parts and high precision part; Be meant and use the very little cutter of diameter; Cooperate little milling machine and the CAD/CAM software of supporting little Milling Process; With very little Machining of Curved Surface error (≤0.1 μ m), obtain a kind of process technology of very high dimensional accuracy (≤0.2 μ m) and surface quality (Ra≤0.1 μ m).Little milling can also be carried out high accuracy and great surface quality processing to the micro-structure characteristic on conventional part or the large mold (for example, minimum thickness is the gusset of 0.5 μ m) except processing the micro parts.Compare with other Micrometer-Nanometer Processing Technology, little milling has that processing cost is low, efficient is high, technical process is simple and advantage such as the range of work is wide, in the processing of MEMS (MEMS) parts, uses very extensive; The sales volume of nineteen ninety global range MEMS is 4.8 hundred million dollars, and nineteen ninety-five is 1,500,000,000 dollars, reaches 13,900,000,000 dollars in 2000; And drive 2,000 hundred million dollars relevant market; Reach 48,000,000,000 dollars in 2005, will reach 95,000,000,000 dollars in 2010, average annual growth rate about 15%.Therefore, carry out little milling and relevant Study on Processing Technology has important theory and realistic meaning.
But microfabrication more is easy to generate burr owing to receive the influence of aspects such as scale effect, cutter geometry, workpiece material and Cutting Process than conventional milling.The existence of burr can influence the cooperation of part, reduces the dimensional accuracy and the surface quality of workpiece, brings potential safety hazard to the user.For example at medical domain, the magnetic suspension heart pump is moving towards practicability, the vital part in the magnetic suspension heart pump---turbine gradually; Because its size is very little; The generation of burr can influence by the blood flow of implant into body, jeopardizes patient's life, so the turbine surfaces quality requirement is just very high.Therefore, especially burr mechanism of production, control and to remove Study on Technology significant in the minuteness milling processing of microfabrication.
Research shows, has edge effect in the microfabrication, just at residing sealing of point of a knife and free space boundary, causes the effect of product to be processed local deformation unstability owing to the change of space constraint.Specifically: when point of a knife moved near the edge, the border produced distortion under the effect of cutting force, and the cutter angle of shear is undergone mutation, and causes the plastic deformation unstability, thereby formed burr.The generation of prior art burr in the control microfabrication has very big deficiency.Thereby it is to be cut metal level under the cutter effect, to produce shearing slip and produce bigger plastic deformation formation that American scholar proposes burr, and has confirmed three kinds of basic burrs formation mechanism: the tearing of the lateral deformation of material, the bending of smear metal and smear metal.
In sum; Most of so far research all is to adopt experimental technique; Find out the influence that each factor forms burr through changing experiment parameter, and all mainly concentrate on the formation of conventional milling burr, form mechanism and control the research of its production method very limited for the minuteness milling burr.
Summary of the invention
The present invention is directed to this present situation, and, proposed a kind of low-melting alloy that utilizes and controlled the method that burr produces in the microfabrication based on theoretical mechanism---the edge effect that burr forms.
The present invention includes following five steps:
1) selects alloy: select alloy species, confirm the thickness that alloy covers;
2) heating and melting: with the alloy heating and melting is liquid;
3) cooling curing: part to be processed is positioned in the mould, and the filling liquid alloy material lets part to be processed and alloy cooling curing be integral on every side;
4) milling: the part to be processed that is covered with material with the milling of minuteness milling machining center;
5) alloy is removed: once more with the alloy heat fused, remove from the treatment of surfaces of components, obtain surface to be machined.
The alloy that the present invention adopted is the low-melting alloy of 47 ℃ or 70 ℃; 47 ℃ of low-melting alloys are the terne metal or the bismuth ashbury metal of gold Yongan, Shenzhen Industrial Co., Ltd., and 70 ℃ low-melting alloy is the terne metal or the bismuth ashbury metal of gold Yongan, Shenzhen Industrial Co., Ltd..The alloy cladding thickness is 2～3 times of minuteness milling tool diameter.Low-melting-point liquid is solidificated on the surface to be machined of processing parts, purpose is that area to be machined with part by the semiclosed closed interval that becomes, extends the edge of part to be processed.Essence of the present invention is to eliminate the generation condition of negative shear zone, makes the working angles of edge stable as non-fringe region.Like this in the scale that carries out milling; Edge effect just adds all on alloy to the influence of part to be processed; Thereby reduced the production rate of burr on the part to be processed, can well control the generation of burr in the microfabrication, made the working angles of edge stable as non-fringe region.
According to the geometric properties and the machining feature of different miniature parts, step 5 also can adopt methods such as the method for immersing, nozzle cladding process, carries out cooling curing then.
That the present invention has is pollution-free, be prone to apply, be prone to advantage such as removal, can effectively control the generation of burr.Through simple feature parts such as this method working groove, through holes, the burr production rate can drop to below 10%, and during characteristics such as processed complex structure such as cross recess, the burr production rate can be reduced to below 30%.
Description of drawings
Fig. 1 is alloy and part to be processed sketch map;
Wherein, 1. alloy, 2. part to be processed.
The specific embodiment
Below in conjunction with embodiment the present invention is further specified.
First embodiment is an example with 47 ℃ low-melting alloys, and step of the present invention is following:
1) selecting fusing point respectively for use is 47 ℃ terne metal or bismuth ashbury metal, and the thickness of alloy is 2～3 times of minuteness milling tool diameter;
2) heating and melting: with the alloy heating and melting is liquid;
3) cooling curing: part to be processed is positioned in the mould, and the filling liquid alloy material lets part to be processed and alloy cooling curing be integral on every side;
4) with German KERN company five minuteness milling machining centers milling part to be processed;
5) alloy is removed: once more with the alloy heat fused, remove from the treatment of surfaces of components, obtain surface to be machined.
Second embodiment is an example with 70 ℃ low-melting alloys, and step of the present invention is following:
1) selecting fusing point respectively for use is 70 ℃ terne metal or bismuth ashbury metal, and the thickness of alloy is 2～3 times of minuteness milling tool diameter;
2) heating and melting: with the alloy heating and melting is liquid;
3) cooling curing: part to be processed is positioned in the mould, and the filling liquid alloy material lets part to be processed and alloy cooling curing be integral on every side;
4) with German KERN company five minuteness milling machining centers milling part to be processed;
5) alloy is removed: once more with the alloy heat fused, remove from the treatment of surfaces of components, obtain surface to be machined.
Claims (1)
1. one kind is utilized low-melting alloy to control the method that burr produces in the microfabrication, comprises following step:
1) selects alloy: select alloy species, confirm the thickness that alloy covers; Described alloy is 47 ℃ or 70 ℃ of low-melting alloys; Described alloy cladding thickness is 2～3 times of minuteness milling tool diameter;
2) heating and melting: with the alloy heating and melting is liquid;
3) cooling curing: part to be processed is positioned in the mould, and the filling liquid alloy material lets part to be processed and alloy cooling curing be integral on every side;
4) milling: with the part to be processed of minuteness milling machining center milling covering alloy material;
5) alloy is removed: once more with the alloy heat fused, remove from the treatment of surfaces of components, obtain surface to be machined.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110106928A CN102211221B (en) | 2011-04-27 | 2011-04-27 | Method for controlling formation of burr in micromachining by low melting point alloy |
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| CN201110106928A CN102211221B (en) | 2011-04-27 | 2011-04-27 | Method for controlling formation of burr in micromachining by low melting point alloy |
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| CN102211221A CN102211221A (en) | 2011-10-12 |
| CN102211221B true CN102211221B (en) | 2012-09-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104439919B (en) * | 2014-10-23 | 2017-07-07 | 山东大学 | Using the method for low-melting alloy secondary process thin-walled flexible member |
| CN105057973B (en) * | 2015-08-03 | 2017-10-17 | 山东大学 | Surface coating PMMA suppresses the method that burr is produced in micro-cutting process |
| CN109759776B (en) * | 2019-03-29 | 2020-12-04 | 上海摩软通讯技术有限公司 | Method for manufacturing mesh component of mobile terminal and mobile terminal |
| CN112984555B (en) * | 2021-04-14 | 2021-08-03 | 中国航发上海商用航空发动机制造有限责任公司 | Workpiece protection method, machining method and workpiece |
| CN113664482A (en) * | 2021-09-29 | 2021-11-19 | 中国航发动力股份有限公司 | Method for machining small-diameter precise hole with incomplete hole wall |
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| JP2003318641A (en) * | 2002-04-25 | 2003-11-07 | Japan Radio Co Ltd | Waveguide slot array antenna |
| CN101376179A (en) * | 2008-09-27 | 2009-03-04 | 北京航空航天大学 | Floating type oval-shaped supersonic vibration micro-engraving device |
| CN101670491A (en) * | 2008-09-12 | 2010-03-17 | 上海蓝盎电子科技发展有限公司 | New micropore machining process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003318641A (en) * | 2002-04-25 | 2003-11-07 | Japan Radio Co Ltd | Waveguide slot array antenna |
| CN101670491A (en) * | 2008-09-12 | 2010-03-17 | 上海蓝盎电子科技发展有限公司 | New micropore machining process |
| CN101376179A (en) * | 2008-09-27 | 2009-03-04 | 北京航空航天大学 | Floating type oval-shaped supersonic vibration micro-engraving device |
Non-Patent Citations (3)
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| 刘志兵等.微小型结构件的微细切削技术.《工具技术》.2008,第42卷19-23. * |
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