Summary: In 6 square the file of body is cut in, the implementation of size control, method that make decides card board really is difficulty, the article raised simple easy travel, managing cost and be helpful for rising solid the method that does training result. Keyword: Benchwork; Operate basically; Below the condition that solid example produces in modern industry, file is cut still is a benchwork is indispensable main main operation. In the task of operation of basic technical ability of teaching material of benchwork solid example, the file of 6 body is cut, its are basic the method is to use angle example or control of all-purpose bevel protractor to measure 120 ° point of view, use card board to measure control edge to grow. Although the method is used easily simplier, but the implementation of size control, method that make decides card board really still is difficulty. To resolve afore-mentioned difficulty, can cooperate the method that cylinder measures with head of clevis of bolster plate C, but the operation rises more complex, and it is easy that the method that more; machines with line cut should compare use tool, but finished cost is higher. Can find out a kind of method to go easily simply already, managing cost, be still helpful for rising solid do training result? Adopt long-term exploration and practice, the author fumbled agree with quite the technique of education activity. Before solid example, should analyse the property of 6 quadrate body. Alleged 6 quadrate body are called in geometry receive inside the circle hexagon, it is a completely symmetrical appearance, its subtense is parallel and equal, the diagonal since of hexagon the diameter of its circumscribed circle, if the graph is shown 1 times,be the special and rectangular ACDF(that with its subtense is short Bian Liancheng) diagonal, two rectangular diagonal phasic difference are 60 ° , its are short the scale of diagonal of ∶ of edge ∶ long side is 1 ∶ 2, nodical O receives the centre of a circle of hexagon and center inside the circle namely, can form two positions to be opposite very congruent equilateral triangle and isosceles triangle. In hexagon is received inside the circle, at the same time existence key is O to nod together, phasic differ 60 ° , and two two common a 3 diagonal congruent special and rectangular ACDF, BDEA and CEFB. Use this one property, can try to change a kind of method to make hexagon receives inside the circle: The first pace, be apart from a group of parallel with hexagon subtense is being received inside the circle first, amid the make choice of on a line seeks a site at some o'clock to another line with diagonal length, fasten 2:0 with this again to make vertical line point-blank relatively, can finish the first rectangular ACDF. The 2nd pace, use 3 rectangle to part the property that public diagonal and phasic difference are 60 ° , it is radius with subtense dimension, draw circular arc to be able to make two groups of parallel for origin with A, D, C, F respectively, and the acme that the node of these two groups of parallel receives hexagon inside the circle namely, hexagon was received to be done inside such circles (if pursue,2 show) . The technique that cuts 6 form and structure for file so provided academic basis, can make a file of corresponding 6 quadrate body cut craft accordingly. Solid example exercise is: It is semifinished product with round steel, use do not delimit the method that machines dimension of line, control line sex finishs file of 6 quadrate body to cut. A homework subject should arrange to the student before solid example: Careful observation, until not have the aid of any measurement tool picture gives approximate 120 ° horn, be close to better more. Solid example unit process of cargo bandling is as follows: The first pace, the circle outside basis semifinished product is fiducial, strictly symmetrical purify surplus, file gives a group of parallel sides, achieve subtense dimension requirement, do not leave surplus. Answer to control dimension, appearance and positional deviation strictly at the same time, surface roughness also should achieve corresponding requirement, this group of subtense do not allow to change again in the in principle in the following treatment (if pursue,3 show) . Right now, the distance between AF of the first rectangular subtense of Ⅰ group, CD decides namely. The 2nd pace, after the first group of subtense are finished, still the circle outside the basis is fiducial, strictly symmetrical purify surplus, and with be more than the angle of 120 ° with included angle of subtense of Ⅰ group, the semmetry below the premise that controlling parallelism strictly undertakes file is cut alternately, two pointed part that should measure angle of cut of two groups of faces to be in right now (arris or apical) , control what diagonal AD makes to achieve a requirement (at this moment the requirement) that subtense dimension must be more than blueprint, right now diagonal should decrease to leave surplus deviation, less as far as possible. Right now the first diagonal AD of the first rectangle is accused finish. The 3rd pace, after looking for accurate diagonal, part again alternant file cuts subtense of Ⅱ group, the form that rotates in order to circle the apical A of diagonal place and D what make, cut with the methodological file of strict parallelism, be close to blueprint requirement stage by stage. Must leave surplus a bit right now, adjust in order to have final choice is repaired. The 4th pace, in the other one aspect of the matter of subtense of Ⅰ group, cut subtense of Ⅲ group according to the methodological file of the 2nd pace, file gives 6 form and structure -- the 2nd diagonal CF of rectangular A, C, D, F, this one step is similar still must the circle outside the basis is fiducial, strictly symmetrical purify surplus. Right now the first rectangle has been finished. The 5th pace, cut subtense of Ⅲ group according to the methodological file of the 3rd pace, the made apical C that circles diagonal place and F rotate, till parallelism of likewise strict control is close to blueprint requirement, leave essence of life to trim surplus a bit. Meanwhile, even close detect the dimension of the 3rd diagonal BE, because Ⅱ and Ⅲ group subtense stay,have a few surplus right now, the 3rd diagonal should be more than blueprint to ask a bit. The 6th pace, essence of life is repaired adjust the 3rd diagonal BE and the 2nd, the dimension of the 3rd group of subtense, measure seriously the 2nd, 3 groups of subtense and the 3rd diagonal dimension, the basis measures result integration analysis to need essence of life to repair the position that file cuts and method, essence of life is repaired all achieve blueprint requirement to subtense and diagonal. Right now the 2nd finish entirely with the 3rd rectangle, finished the file of 6 quadrate body to cut namely. After Nextpage was finishing argumentation, enter a task to carry out level namely. Those who follow a solid example task launch discovery, all do not have correctly in dimension of diagonal, subtense by accident below the circumstance, appeared the Bian Changsan of 6 quadrate body is long, 3 short, the condition that alternate with arranges. What reason is this? Through be opposite receive inside the circle the further analysis of hexagon, had new discovery (if pursue,4 show) . If move the hemline CD of hexagon ABCDEF up,a distance comes ′ of C ′ D, to make sure subtense dimension is changeless, the subtense AF of CD also must move accordingly to be apart from likewise up to ′ of A ′ F, the direction that moves as a result of a group of subtense and space are same, namely ′ of CC ′ =FF, ′ of AA ′ =DD, reason rectangle ACDF turns ′ of C of ′ of A of an isosceles echelon into ′ of D ′ F, but diagonal AD and CF are corresponding ground translation arrived only ′ of A ′ D and ′ of C ′ F, its length does not have a change, the ′ of D of ′ of BC of hexagon A ′ that this formed border of accident of an alternate with EF ′ , the problem was found. In solid example operation to save cost, use semifinished product is the round steel that supplies condition, the symmetry; student that round precision can affect purify surplus outside its has in the operation in the exercise by accident, fail to master symmetrical purify surplus strictly, can cause subtense the translation of relatively academic center, 6 body of edge of accident of occurrence alternate with. How to solve this problem? Should build accurate fiducial. A kind of method is machine treatment car goes accurate outside round, cost is higher, periodic and longer, waste is bigger. Another kind of method is round outside semifinished product center place getting, bore with a reamer gives a fiducial opening, control the symmetry of subtense definitely with Kong Weiji next, because the precision of aperture of bore with a reamer is enough tall (IT7 ～ IT9) , can overcome an edge effectively to grow metabolic malady, file gives 6 eligible form and structure. Above file cuts a method to have the following and outstanding characteristic: (1) the 2nd, the 3rd group of subtense are with gyral method file is cut, want cogent control to be able to become exterior file a plane right now, and not injury and diagonal, rise to skill of basic technical ability have very big promote. (2) measures diagonal length is the measurement that is in to pointed horn, this is about to try pair of measurement technique (if the graph is shown 5 times) master with what measure power proper, promoted those who measure technical ability to rise again. (3) has firmer demand to purify burr, want effectively purify burr already, cannot destroy pointed part again, this is about to choose to prick a method appropriately. (4) is repaired in essence of life adjust level to the student use mathematical knowledge, increase concrete analysis problem and the ability respect that solve a problem, have exercise action very well. (The dimension of workpiece of task of 5) this training can need according to the task and decide, and a semifinished product can practice multistage dimension, practice via pouring wine cup finally, can machine 6 nut. After solving file successfully to cut issue of technology of 6 quadrate body, does the methodological file that can still you use measure of control line sex cut 5 quadrate put oneself in another's position? Receive inside the circle pentagonal with hexagon is received to differ inside the circle, it is odd edge, not be a completely symmetrical structure, but can decompose its a certain number of the triangle that has stability structure (if pursue,show) 6 times. Whole process around move triangular ACD(DAB, CEA) grow high by the side of with two waists, can machine piece 5 quadrate body. Technique is as follows: The first pace, file cuts Ⅰ (CD) face, use 5 form and structure: Tall =0.
9045D circumscribed circle, diagonal =0.
951D circumscribed circle, computation gives the surplus that needs purify, direct file is cut achieve precision requirement. The 2nd pace, wait for quantity file to cut Ⅱ at the same time (AK) and Ⅱ (AL) two sides, angle should be more than 108 ° (be more than a bit with range estimation control as far as possible can) , measure AF to control the height of 5 quadrate body, should control AG(Ⅱ ′ at the same time) =AH(Ⅱ ′ ) in order to master semmetry. The key of this one pace is the height that file gives 5 quadrate put oneself in another's position, AF wants as far as possible accurate. The 3rd pace, cut Ⅱ with file (the method of AK and AL) , file cuts Ⅲ area, make AC and AD achieve craft requirement. 3 acme of isosceles triangle ACD are right now affirmatory already. This is to be file to cut 5 body to lay a foundation, it is very crucial one step, accordingly, AC and AD want already equal, should ensure again precision. The 4th pace, rotate alternately respectively Ⅱ (AK) and Ⅱ (AL) is mixed to AB the position of AE, right now can the high DP that pilot can be an isosceles triangle only and CQ, the margin that cannot gauge an isosceles triangle grows CE and DB. Accordingly, should master strictly above all measure precision, its secondary put apart is proper (as far as possible little) essence of life trims surplus, amend the dimension of BD and CE in order to facilitate. The 5th pace, with as same as the 4th pace method, rotate Ⅲ (CN) and Ⅲ (DM) , right now, because B, E still cannot decide at 2 o'clock, reason cannot onefold with measure the methodological control with tall isosceles triangle to rotate quantity, can pass only measure diagonal BD and CE, and with the triangle tall as auxiliary parameter, consider surplus of put apart of place of the 4th pace to be affected to what measure as a whole at the same time, this is about each element is opposite integration analysis the influence of treatment, adopt method of alternant pilot advance gradually, amend accurately to the surplus of obligate of the 4th pace timelily. Because need to revise surplus very small, can achieve a requirement immediately so. 5 form and structure that file cuts are comprise by odd surface, file cuts the technique in the exercise undertake in order to control the principle of the isosceles triangle, accordingly, cut appearance of 6 quadrate substance to cut 5 quadrate body to have better stability than file with file, complete need not the method that have the aid of is in aperture of bore with a reamer at the center. Undertake according to this train of thought outspread, see file cuts tripartite body to be able to use method of dimension of control line sex likewise not hard, and adopt practice already got confirming. In the education practice that be in, perfect further through be being mixed to the development of this task, this task trains a respect to have original place in main operation: Above all, in operating training basically, the control of this kind of technique to skill of main operation skill and rise have very strong stimulative action and practical. For instance, directional option is cut to file in the exercise, to rotating the palm of method and precision accuses, the method of purify burr, measurement technique and precision are obtained wait for a respect, have through training very big rise. Next, to the real problem that encounters in the exercise, requirement student has the relevant knowledge of the respect such as certain maths, and can handle these intellectual analysises and the real problem that in solving training, encounter, the ability that analyses a problem to the student has stronger education and exercise action. Again, cut the course of tasks of 6 body of square, 5 square, tripartite as file, craft analyses a respect to be able to a few simplify, but taller and taller to main operation and metrical demand. As training task successive ground spreads out, main operation level of the student gets rising stage by stage. Anyhow, this kind of technique is taller to the demand that handles basically, skill of main to rising operation and skill and analytic problem and the education that solve problem ability and take exercise have very good stimulative effect. Education high school student is mirrorred generally, after practicing through this series task, not only basic skill has very big rise, the train of thought that analyses a problem also becomes much smoother. CNC Milling