SU1091953A1 - Blank clamp of pipe cold rolling mill - Google Patents

Abstract

CARTRIDGE PREPARATIONS OF COLD CLEANING MACHINE, comprising a housing, its rotational drive, shunt-locking jaws mounted inside the housing and perpendicular to the housing axis, shafts with eccentric 1 necks, and a shaft rotational drive, characterized in that, in order to improve the supply stability of the billet and the quality of the finished pipes, the shafts with eccentric necks are parallel to the axis of rotation of the cams, their eccentric necks are freely supported on the cams, and the rotational drive of the shafts is made in the form of levers rigidly placed on them and enclosing case with possibility and; forced movement relative to it of an annular cage having (L c) radial grooves in which the ends of the levers are freely placed.

Description

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Fig. 1 The invention relates to pipe-rolling equipment, namely, devices for clamping and axial feeding of tube blanks. in the deformation zone in the cold rolling mill pipe, mainly with a stationary working stand. The cartridge chuck of the cold-rolling mill tube is known, which includes a housing, a drive spindle mounted on it, a spindle placed in the bore of the spindle, clamping cams associated with the spline having inclined surfaces, interacting with the corresponding spindle surfaces ij. The disadvantages of this cartridge are the instability of the feed of the billet to the deformation zone caused by their improper clamping, due to the absence of a plenary drive of the clamping jaws and the axial displacement of the billets, their clamping caused by the axial movement of the cams relative to the body of the cartridge, and also a limited range of diameters clamped blanks. . The closest to the proposed technical essence is the cartridge of the cold rolling mill tube, which includes the housing, its rotational drive, rotatable jaws mounted inside the housing, and shafts with eccentric necks perpendicular to the housing axis, and the rotational drive of the shafts. At the same time, the clamping cams are loosely mounted on the eccentric shaft shafts, and when turning the shafts they are made in the form of gears mounted on the ends of the shafts and connected with gear racks, which in turn are connected to the casing and are pressed to the gears with a spring. Installing clamping cams on the eccentric necks of the rotary shafts will expand the range of diameters of the clamped pipes. However, during the clamping process, the clamping cams move relative to the longitudinal axis of the xpfus, which leads to axial displacement of the workpiece relative to the deformation zone. The presence of a forced drive of the clamping cams only slightly increases the stability of the feed of the workpiece, since the use of a spring as the main element of the drive limits the clamping force and reduces its reliability. In addition, the axial forces in the billet during the rolling process tend to shift it relative to the chuck, which, when using the cam spring drive, either causes a spontaneous release, in which the billet slides relative to the clamping jaws, or it is pinched to see it leaving traces on its surface is in the form of scratches and holes. All this leads to a change in the size of the workpiece feed, increasing its instability, especially in mills with a stationary working stand, where the workpiece is clamped and fed during each double stroke, and also reduces the quality of the finished pipes. The purpose of the invention is to increase the stability of the supply of the workpiece and the quality of the gat pipes. This goal is achieved by the fact that in the chuck of the billet of the cold-rolling mill for pipes, the housing includes a pivot drive, pivoting jaws mounted inside the casing: And, perpendicular to the pivot axis, the shafts with eccentric necks and the shafts with eccentric necks are parallel the axis of rotation of the cams, their eccentric cheeks are freely supported on the cams, and the rotational drive of the shafts is made in the form of levers rigidly placed on them and enclosing the body with the possibility of forced movement from ositelno has an annular yoke having radial grooves in which the ends of the levers are placed freely. Such constructive performance of the cartridge allows for the moment of contact of the eccentric shaft journals with the clamping jaws, a constant pressing force of the latter to the workpiece, i.e. reliably clamping it, and excluding their axial displacements relative to each other at STgM, which also increases the stability of the billet feed, the quality of the finished pipes and, in addition, eliminates pinching or stretching of the billet during deformation. Figure 1 shows the cartridge billet mill cold rolling tubes; figure 2 - section aa in figure 1.

Claims (1)

PREPARATION CARTRIDGE OF THE PIPE COLD ROLLING MACHINE, comprising a housing, its rotation drive, rotary-clamping cams installed inside the housing and shafts with eccentric necks perpendicular to the housing axis, and a rotation shaft drive, characterized in that, in order to increase the workpiece feed stability and the quality of finished pipes, shafts with eccentric necks are parallel to the axis of rotation of the cams, their eccentric necks are freely supported on the cams, and the shaft rotation drive is made in the form of levers rigidly seated on them and covering pus with the capability of forced displacement relative thereto annular yoke having radial grooves in which the free ends of the levers are arranged. >