SU716676A1 - Hole-coring method - Google Patents

Description

(54) METHOD OF PROMOTION

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The invention is related to the field of mechanical engineering of shine construction | l in particular to the processing of workpieces without removing the chips. The known method of compacting blanks according to compression or stretching patterns, used in the processing of blanks and short molds with blanks with a ratio of length to diameter less than 5 11 J. / However, tseforshfovansh zagotok type liners and long cylinders these

Sp x; Obi do not provide a batho of the accuracy of machining due to the non-uniformity of the forming hole of the machined hole due to insufficient longitudinal stability and their difference in tube blanks.

There is also known a method of backing with counter-resistance, ensuring .11 due to the tension of the support device, the axial deformation of the shortening of the workpiece 2 is restrained.

Due to the fact that the Miio D process of pinking, the axial tensile stresses are altered and the workpiece is

over wide limits, the holes that are deformed in a different manner are variable diametrical dimensional accuracy and. forty s.

The aim of the invention is to provide a constant along the length of the workpiece diametrical nausea bore- ,.

This is achieved by the fact that it is occasionally experienced by burnishing. The level of axial tensile stresses is established, and in the process of overhanging, this level is maintained at a constant rate by changing the direction and magnitude of the axial force against the tension.

The drawing shows a diagram of backing with an antiblocking according to the proposed method, where 1 is the support for the mandrels, 11, 2 is the tensioning arrangement of the supports, 3 is the bulging mandrel, 4 is a dummy blank with two flute technological grooves ..

Arrows A and B show the directions of the possible axial movements of the tension device, point B - roll T etitfe, with KoTOjxiM tension device - and rigidly fixed in 1) the support, P - with – yy – dornov 1. The proposed method is ocjiaecTBrtsnoT in the following: 1g1 lead data. Predbapin-crtbtio experience by means of the design of the accuracy of the holes of the workpieces from the actual axial stresses of tension. This dependence is established to achieve a given diametrical accuracy of the holes within the stress range not exceeding the magnitude of the conditional yield strength. The metal of the blank is broken. So ashshi; The design of the system is effective, the desired set, the accuracy of the openings of the supports and supports them constant when the workpiece is deformed by the end teeth of the Dorn by changing the direction and size r r fs & m- s v mfmmm. The effective values of axial stresses can be determined by drr as a direct measurement, as well as through other parameters (for example, the pressure in the hydraulic systems of the machine drive and tension head, etc.). For example, the Bulk dornovaniam of the proposed method is processed blanks from gh-p chedoformgovannyh 8732-70 /; З5 :: toast To the distance from | Eden data processing, the level of total axial stresses is established, which is maintained constant during the backing process by Yontsev | K me to (78.9 and 79.5). At the same time, the working axial stresses of tensile stress on the gauge installed in the hydraulic systems of the main machine and hydraulics of the support, connected to the hydraulic system, are carried out by processing a bulk d81p "b1 (yrm of the workpiece 3 times, X tS-j 6.4). ornament in zagotbvKu axial tension in.,,,. 7 b 87s1-74, length 775 mm. Preliminary in the blanks are two technological KajtaBKH with a depth of 3 mm and a width of 12 mm from each end of the workpiece, the dredging is done on a horizontal stretcher machine support I Lubricant - sulfofresol. Tool - multi-tooth assembly mandrel equipped with five carbide teeth, tooth mandrel diameters, mm: 74, 4} 77.4; 78.2-78.9; 79.5. It depends on the accuracy of the treated dynovyl y K: f -,, Jv.-.--- r ---; -:, - - .-: - - --.- - -; - - by opening the holes in the pipes blanks from the level; effective: total axial stretch marks, set in the range of 0.10 - 0.96 from j-cnoBHoro yield strength of the material of the blanks. For this purpose, a trial dynovaniya party; blanks with the subsequent statistical processing of the results of the experiment. The diametrical accuracy of the holes is characterized by the difference in the diameter of the hole. - clmin after balancing. The table shows the test results, where is the conditional yield strength, for steel 35, it is 32 kgf / mm2. .., IW Mment entry into the hole of the fourth tooth mandrel reaches 1 kgf / mm. The tensioning device is moved in the direction of arrow B, opposite the movement of the mandrel. The voltage at LENCHETS TV reaches a predetermined level of 6.4 kgf / mm when the tensioning device is moved 2.5 mm. Stop the movement of the tension device and the process of dorinating the proDy5Ka | ts 1FI fixed stationary tension device (point B). When the first teeth of the mandrel exit the hole & 1СЧ5т6йКи For example, the syony drops to 5.8 kgf / mm At the same time move

tension device in the direction of arrow A, coinciding with the direction of movement of the mandrel, up to the established tension level, kbory occurs when the tension device is moved 1 mm.

The accuracy of the holes in the dough billet processed is a ficeif length of 0.027 mm.

Claims (2)

With an increase of 2 to 16 n 28, 8 kg / mmg, the accuracy of the hole is increased to 0.016 and 0, respectively. Formula of Invention An anti-wear method of resistance, characterized in that, in order to ensure a diametral hole opening that is constant along the length of the workpiece, it is necessary to preliminarily set the level of the J outcrank stresses, and in the process of overhanging, they maintain this level by a constant way of countercurrent. 10 Sources of information taken into account during the examination 1 Vestnik Mashinostroeni, 1973, No. 3,: p. 51-52. five 2. USSR author's certificate number 553060, cl. B 21 75 41/00, 1975