SU1398992A1 - Method of working crankpins of crank shafts - Google Patents

Abstract

The invention relates to mechanical engineering and may find application in the machining of the crank shafts of the crankshafts, including the repair of the latter. The aim of the invention is to increase productivity and machining accuracy by reducing the unevenness of the allowance and increasing the durability of the crankshafts by increasing the number of possible repairs. According to the method, a fixed rotation of the crankshaft 1 relative to the main journals is carried out for its orientation relative to the axis of the center-displacement 10 of the machine and subsequent machining. The crankshaft 1 is rotated before fixation until the maximum deviations, equal in magnitude but opposite in sign, relative to the nominal height of at least two crank pins are obtained. 3 il. -. a s (L

Description

W

i

oo cx

fig 1

The invention relates to mechanical engineering and will find application in the machining of the connecting rod journals of crankshafts, including the repair of the latter.

The purpose of the invention is to increase productivity and machining accuracy by reducing the unevenness of the stock and increasing the durability of the crankshafts by increasing the number of possible repairs.

Figure 1 shows the installation of a crankshaft in the center-displacement of the machine; figure 2 - section aa in Fig., with the initial position of the crankshaft connecting rods; Fig. 3 is a section A-A in Fig. 1, with the crankshaft crankshaft crankshaft in position at the time of completion of its fixed rotation.

The method is as follows.

The crankshaft 1 is installed in the centering device 2 of the machine to its original position, pre-oriented in one of the technological or structural bases, for example, in the keyway 3, and on axes of symmetry 4 and 5 of the nominal angular position of the crank journals 6-9. One of the axes of symmetry 4 of the nominal angular position of the connecting rod journals 6–9 intersects the axis 10 of the vrash, the centrifugal axis -2 and the common axis 1I of the first and fifth crankshaft journals t.

The geometrical axes of the connecting rod necks 6-9 have, respectively, the deviation values l, -L relative to the axes of symmetry 4 and 5 of their nominal angular location. Having determined one of the connecting rod necks 8, for example the third one, the geometrical axis of which has in its absolute value the maximum zng

curvature deviation

tttO l

shaft 1 is rotated so that & num is reduced until it is in absolute magnitude compared with the current deviation value — the geometric axis relative to the axis of symmetry of the nominal angular position of any other connecting rod 6, for example, the first one. At the same time, crankpins have deviations: l, - e. In such a position, the crankshaft 1 secures and processes the crank neck, for example, the first 6, which is closest to the axis 10 of rotation of the centrifugal 2. By turning the subsequent crank journals 7, 8 and 9, the crankshaft I is turned by means of a dividing device (not shown) the angle of the nominal position of the connecting rod necks.

Claims (1)

Invention Formula The method of processing crankshaft crankshaft journals, according to which the crankshaft is fixed to rotate relative to the main journals of its orientation relative to the axis of the machine's centrifuge and subsequent machining, characterized in that, in order to improve performance and accuracy of processing by reducing the unevenness of the stock and increasing the durability of the crankshafts by increasing the number of possible repairs, the crankshaft is rotated before fixing until equal in magnitude, but opposite in sign, to maximum deviations relative to the nominal angular position of at least two crankpins. FIG. 2 s-a