Undertake to workpiece with machine of electric spark aggrandizement exterior wool changes processing

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1 overview   is in mechanical, car, electron, light industrial etc in the domain, the face that has many mould, work needs to undertake Mao Hua is handled (form the even and densely covered indentation that has certain depth in workpiece surface namely) , this technology gets those who apply a large number of home appliance that sell on the market at present, electronic parts earlier note model in automobile industry, used all sorts of beautiful, applicable decorative pattern design mostly (for example leather grain, orange skin grain) , be being told on broad sense also is a kind of Mao Huatu the case is Baconian its surface Mao Hua machines a method, substantially is divided (1) electrochemistry, chemical method; (2) gush pill law; (3) high-energy bundle spread illuminate standard; (4) the working principle of machine of aggrandizement of electric spark of principle of work of engine of aggrandizement of 2 electric spark is like workpiece of Mao Hua of law of electric spark discharge the graph is shown 1 times, what differ with electric spark machine tool between electrode and workpiece adding after voltage classics transformation, commutate is: Electrode is not to use servo feed, workpiece also does not need to be buried in the as a result of oscillator action in working fluid, make workpiece and electrode produce frequent contact, generation discharge capacitance is controallable the energy that discharges every time. Graph principle of treatment of aggrandizement of 1 metal electric spark pursues 3 experiments condition and material of workpiece of test result experiment use: 45 steel, A3 steel, stainless steel (1Cr18Ni9Ti) . Electrode material uses respectively: Hard alloy (YG8) , high-speed steel (W18Cr4V) , high-carbon steel (T8) , brass. The primitive data of workpiece material sees a table 1. One of quality index after Mao Hua are to see surface roughness be worth Ra even. The wool that this experiment issues to each craft parameter changes the surface to measure the Ra value of 3 department position, computation gives the error that Ra is worth, print the microcosmic geometry appearance that gives Mao Hua appearance. Express 1 material dimension (long × wide × is tall) / Mm surface roughness Ra is worth / μ M hardness / 70 × of HV4585 × 250.

4386 stainless steel 50 × of 90 × 30.

100 × of 2-A3120 × 30.

Experiment of 4-     is with aggrandizement machine: Factory of electric equipment of Jiangsu sea hill (Suzhou) machine of aggrandizement of manufacturing D9910A electric spark. Measure an instrument to be: Factory of Harbin measure cutting tool produces 2201 model the HX-1 that factory of instrument of experiment of miniature of Wu Zhong of; of appearance of coarse servy record produces the appearance microscopical sclerometer. If experimental result is expressed 2, matrix (workpiece) material is 45 steel. Express 1I=1 of 2     .

7 ~ 2.

0A2I=1.

0A ~ 1.

2A3I=0.

8A ~ 1.

0A4I=0.

4A ~ 0.

8A hard alloy 2.

21.

72.

01.

82.

02.

41.

82.

52.

22.

02.

42.

7 high-speed steel 1.

82.

22.

22.

61.

82.

41.

51.

52.

02.

83.

02.

6 high-carbon steel 1.

21.

41.

61.

21.

61.

82.

12.

01.

91.

71.

81.

8 brass 1.

11.

51.

21.

51.

51.

21.

41.

31.

51.

41.

71.

Two index arrive the uniformity that wool of 3     changes exterior quality to be able to use indentation deepness and the uniformity that distributing the evaluation is former those who use Ra " opposite error is worth " express, latter can be shown by exterior outline come. × 100% , in type? Be Ra " absolutely error is worth " , it is the average of Ra on behalf of the poor X0 that is worth by average of evaluation surface Ra and experimental Ra. ε value can regard an evaluation as the reference of the even degree of Ra, when ε <40% , can think to accord with Mao Huabiao to allow by the watch 2 be informed, with high-carbon steel electrode, the error when 2 archives is the biggest, ra is: 1.

2 μ M, 1.

6 μ M, 1.

8 μ M, ε Man=(eligible) . Express 3 records in stainless steel board on after Mao Hua detect data. Express 3 matrix (workpiece) for archives of stainless steel power source high-carbon steel of material of electrode of 1234Ra/ μ M 1.

41.

41.

51.

21.

41.

41.

41.

41.

11.

41.

31.

1 high-speed steel 2.

02.

21.

71.

81.

51.

91.

41.

61.

61.

41.

61.

2 hard alloy 1.

01.

31.

21.

21.

41.

41.

41.

41.

41.

61.

61.

3 brass 1.

61.

61.

51.

61.

61.

51.

71.

61.

71.

61.

51.

4     is expressed 4 it is 4 kinds of electrode, 4 kinds of archives of power source below, wool converts the Ra data that detects on contourgraph after A3 armor plate. Express archives of 4 power source high-carbon steel of material of electrode of 1234Ra/ μ M 1.

21.

21.

01.

11.

21.

21.

21.

61.

41.

41.

51.

6 high-speed steel 2.

01.

81.

62.

21.

62.

01.

41.

21.

41.

31.

21.

4 hard alloy 1.

20.

91.

01.

82.

01.

61.

41.

81.

41.

41.

51.

7 brass 1.

41.

51.

41.

31.

51.

31.

71.

61.

41.

41.

41.

4     is analysed by above test data, serve as electrode with material of hard alloy, high-speed steel, when wool turns 45 steel work, ra of surface roughness value is bigger, highest when Ra=3.

0 μ M, and value of the others Ra is lesser each archives when differring, report gives discharge electric current to differ, discharge energy is different, will tell commonly, discharge energy is big, ra value is great, but do not have clear rule sometimes, specific data is contrary even, speed of the shift when the specification is operated by hand, pressure, angle has an error nevertheless, the opposite error of Ra still is in 40% less than, accord with quality requirement to look from exterior outline curve, change of wave crest, trough is relatively smooth, even, sharp drop is less, special after 4 wool turn the expectation result that accords with wool to spend spring microscopical when hardness measures mechanic of electric spark aggrandizement to make, tool electrode is driven in oscillator move to workpiece, when clearance is close to certain distance, the air puncture inside meeting general clearance, produce scintilla to discharge, when electrode continues to approach work, can generate instantaneous short-circuit current, make the place continues to because there is proper pressure between tool, workpiece,heat, the material that made fuse mutual felt, diffuse, form infiltration layer, the move that produced material, enclothe, this is the important distinction that machines the surface with electric spark changes a function besides wool namely outside, still have aggrandizement function, achieve the goal that machines integratedly. The ply as a result of layer of electric spark aggrandizement is thinner (estimation is in 0.

10 millimeter less than) , can use only so microscopical sclerometer is measured, if express,measure an outcome 5. Express 5 matrix material to be archives of 45 steel power source character high-carbon steel of material of electrode of 1234Ra/ μ M 196918361969171519691508133516061335150714171191 high-speed steel 101511911069112814181191106911281191126011281191 hard alloy 96511951015965875762   of   of   of   of   of 119114171335119110691260150711281191118511621126 brass   45 steel are in     the diamond pyramid hardness before Mao Hua is HV=386 only, and classics Mao Hua, aggrandizement hind is microscopical hardness has when rising to should use hard alloy electrode especially significantly, HV=1300 ~ 1900, this is told to the mould can improve its service life significantly to general work, the mechanical physics that changed the face is characteristic, achieved " outside hard inside pliable but strong " 5 conclusion use the effect workpiece of Mao Hua of machine of electric spark aggrandizement is a kind of better technique, it has following characteristics; 1) electrode makes simple, agile Bencishi check uses a diameter to be φ the electrode of 3 is marvellous, the operation of 2) of electrode material   that can ask to choose to differ according to workpiece is convenient, workpiece does not need embedded job fluid, hold a tool, can the place   that Mao Hua arrives at hard with common method 3) invest little, cost low, agree with the exterior wool of small area changes   4) not only Mao Hua can achieve quality to ask, and return aggrandizement workpiece, have the technical effect that machines integratedly. But look from experimental process and result, because be manual operation,it still is put in inadequacy, the size of uniformity, pressure is controlled not easily, be in same a place, handling time also hard even these problems can use certain measure to try to solve, put the tool on the orgnaization that has constant to decide pressure for example, use motor-driven feed means (the Mao Huayou of great to the area work its are important) etc, the meeting is better the problem that solves existence. Note: This experiment gets Zhao Fuling is taught give advice or comments, send gratitude sincerely CNC Milling CNC Machining