SU689770A1 - Tool for rolling toothed wheels - Google Patents

Description

(54) TOOL FOR ROLLING OF TOOTH-WHEELS

one

The invention relates to the processing of metals by pressure and can be used in the manufacture of gear wheels by rolling.

A known tool for rolling gear profiles by the method of axially feeding a workpiece containing a conical intake and cylindrical calibration sections

When rolling gear wheels with axial feed, the angular velocity imparted to the shaft mill does not coincide with the angular speed from the dividing mechanism and does not remain constant during the rolling cycle, which causes the hot gear teeth to shift in the direction opposite to the direction of rotation, as a result of which the uniformity of the steps of the teeth and there is a deviation in their direction.

Also known is a tool for rolling spiral kangshok on a wire, having a curvilinear working surface with protrusions L2j |.

This tool is the closest to the invention of the technical essence of the achieved result.

However, the parameters of the working surface of this tool are not related to the geometry of the gear sections and, therefore, it cannot be used for rolling gears with a given accuracy.

The aim of the invention is to improve the accuracy of the profile of the teeth of the wheels.

0

The goal is achieved by forming the outer surface of each toothed flange described by the equation:

15

. (BUT -

where: Rex is the current radius of the outer surface of the roll in the section of the plane, perpendicular to the axis of the roll;

The minimum distance between the axles of the rolls at the point of overlap of the axes; Luf - current distance from

the point of intersection of the axes to the considered section of the toothed roll; SL - the angle of the roll axis

to axis zagrvki; the current radius of the workpiece at the pits of the rolled teeth; - the angle between the radius at the point of contact of the top of the tooth of the roll, with the workpiece in the roll section in question and in the section passing through the point of intersection of the axes. The drawing shows the rolling scheme proposed by the tool.

The upper section of the rolls is the smallest in diameter and is located at the smallest distance from the axis of the workpiece AO. The lower section is the largest and corresponds to the largest center-to-center distance of the line of contact of the rolls with the workpiece | n 11. Point K - the place of contact of the rolls with the workpiece in the section xx The rolls are shaped in such a way that two conditions are met

contact, rolls with the workpiece occurred along the line, (in the drawing mn); the ratio of the radii of the roll and the workpiece would be equal to the gear ratio at any point of contact, i.e.

Cr.H.YOAL - 1, ti / 7

where PPV is the roll radius along the top of the teeth in the section under consideration; d - the angle of inclination of the CXI roll

to the axis of the workpiece; iV - the radius of the workpiece along the depressions in the section xk; And the number of roll teeth and

pinch.

This relationship is fulfilled if the tool has a variable radius over the weights of the teeth; whose value corresponds to the following equation lj

Moreover, where is the roll radius on the verching of Zubiev in the smallest section (the value is constructive); 2i 1 is the radius of the mesenteric depression; Y is the angle between the radius at the point of contact of the top of the tooth of the roll with the workpiece in the section under consideration and in the section passing through the point of intersection of the axes.

f a ct§bx: is,

where L V is the distance from the point of intersection of the axes to the section of the Banka xx.

The tool works as follows.

The roll supports with a surface corresponding to equation 1} are set at an angle L to the axis of the workpiece and the last movement in the axial direction.

In this case, the rolls and the workpiece are rotated. The shape of the surface of the rolls, forming which is described by the equation, ensures the rotation of the workpiece, the same in the number of revolutions with the rotation obtained from the separating mechanism, starting from the capture of the workpiece and ending with the output of the formed toothed profile.

This will increase the accuracy of the rolling gears and, in a number of cases, will give the opportunity to refuse finishing the gearing.

Claims (2)

1. The patent of the Federal Republic of Germany 1013612, cl, B 21 H 5/02, published. 1953. 2. US Patent 3258949, cl. 72-103, published. 1966. R