(picture 1. The cutting of pipes according to traditional scheme and a shape of the pipe face after cutting.) (picture 2. The cutting of pipes by using of incision knife and a shape of pipe faces after cutting.) This phenomenon could be removed by using of auxiliary operation, which precedes the basic cutting by wedged-shaped knife. This operation is contained in making of incision by the auxiliary knife from the surface of the pipe and weaking its section in the part for inputting of wedge-shaped knife. Dividing the pipe into measured lengths by the scheme, presented on the p.2 is accomplished by means of using the special stamps, which are placed either on the standard, flying scissors or on the, arranged on the line, pipe-welding mill ones. At present time, in spite of the fact that there exist a great number of such stamp constructions (3,4), much work is being presided for its modernization. By all these facts, some difficulties connected with the absence of theoretical dependencies and experimental data which provides the opportunity to calculate the optimal energy-power and geometrical characteristics of the presented cutting equipment arise. Taking in consideration the given problem, the modeling of pipe cutting process with the help of flying scissors was made by the collaborators of the MEFMP department. The aim of such work is the studying and appraisal of influences of the shape, geometrical sizes and moving speed of the wedge-shaped knife on the effort and cutting quality. The modeling was carried out on the laboratory equipment, which is schematically presented on p.3. This sat includes the bad (1) with stakes, on which the beating mechanism and cutting knot was settled. The beating mechanism consists of directive pipe (2), beater (3) and its fixer. The cutting knot consists of two fixed knives (7), arranged with spacing for the wedged-shaped knife passage (6). The wedged-shaped knife, keeping back from side displacements during the moving concerning the immovable knives is carried out by two side lids. The cutting knot immovable parts are fixed by two upper lathes (10) and two lower ones (9). The wedge knife is fixed on the support-chuck (5) with the help of bolt junction. Cutting effort could be presented as some static force, which causes the appearance of elastic deformation in the hold of the knife. Therefore, apart from the cutting speed and time, cutting effort is characterized by elastic deformation of the support-chuck, t.e. in any working regime of equal elastic deformation of the knife hold must correspond to equal in meaning cutting effort. For the effort data control of the process of pipe cutting on the support wedge knife effort indicators connected by means of bridge scheme was stuck. The structure scheme of the measured system which is used is shown on the picture 4. The principle of its action consists of the follows. Electric signal which appears during the misbalance of the measured bridge at the moment of the appearance of effort indicators deformation under the influence of cutting effort, is supplied to the enter of amplifier with stabled power block. During the process of cutting the aluminum pipes with diameter of 12mm and thickness of 1 mm were used. Here three wedge knives were used. Their turn angles correspondingly are the follows: 85, 90, 95. For comparison of the conditions of pipe surfaces cut by wedge knife according to the traditional scheme and with using of preliminary short cut two serious of experiments were hold out. During this process were used the cutting effort and section pipes scissors control with different combining of researching factors. Taking into account the high speed of the pipe dividing process (0,01 with knife moving speed of 1 m/c), ANT was set up on the friquensy of 5 kGz. The registered signal is displayed on the monitor screen and on the print for the following studying at the same time (p.5). The diagram of changing the cutting efforts during the period of time presents three sections, which correspond to cutting periods process. They are: insertion of the knife into the pipe body (1), metal moving along the cutting surface (2), and braking the rest uncut part of the pipe section (3). Thus, the correlation of the influence efforts of the wedge knife during the given periods and loading distribution for rolled metal cutting are principally different. Therefore, the using for the calculation of rolled metal cutting effort received for profiles with crossing section is impossible. It demands the theoretical statements that correspond to the specialties of thin-walled pipes cutting. After the analyses of the results some conclusions can be made. The demanded quality of cut pipes face surfaces could be provided only by using of combined cutting scheme. It must follow the preliminary weaking of the pipe section in the place for insertion of wedge-shaped knife. Other way the face part of the pipe will be took off. The photo on the picture 6 confirms the said above. The cutting effort control data shows that the optimal turn angle of wedge knife is 90` because only in such conditions the normal quality of the cut pipe faces with minimum cutting efforts are provided. The received results of modeling of the process of the qualitative thin-walled pipes cutting were used during the preparation of work projects of new two stamps. They provide the pipe cutting for equal parts without face crumples. Experimental-industrial example of one of the given stamps was examined in the pip-welding shop of OAS "DMP".