Method for producing threaded screws with large bearing locations

Abstract

The invention relates to a method for producing a bearing bearing ( 16 ) or drive journal ( 20 ) having a large diameter on a rolled threaded screw ( 12 ). According to the invention, the blank (12) of the threaded spindle is thermally upset in the longitudinal direction (11), so that the blank is arched radially relative to the longitudinal direction (11), wherein a first longitudinal region with an enlarged diameter is produced (14).

Description

technical field

[0001] The invention relates to a method for producing a lead screw. Background technique

[0002] From DE 10 206 744 B4 it is known to manufacture a threaded screw by the thread rolling method. In this case, a blank extending in the longitudinal direction is provided on its outer circumference substantially over its entire length with at least one helical groove in which the balls of a ball screw drive, for example, can run. After rolling the thread, the blank is typically machined in order to produce a bearing bearing point for a radial rolling bearing or a transmission journal for connecting an electric motor or a transmission at the end.

[0003] The maximum diameter of the bearing support portion and the transmission journal is limited by the root diameter of the helical groove. In this case, it is possible that the achievable diameter of the radial rolling bearing or of the transmission journal is not sufficient to permanently transmit the loads occur...

Examples

Embodiment Construction

[0027] figure 1 A side view of a schematically simplified illustration of a device 40 for carrying out the method according to the invention is shown. The device 40 includes a solid base frame 41 which extends parallel to the longitudinal direction 11 of the blank 12 . A first and a second identical stop angle bracket 42 , 43 are fastened on the base frame 41 in a position-adjustable manner in the longitudinal direction 11 , so that the device 40 can be adapted to different lengths of the blank 12 . The flat stop surfaces 44 of the stop angle brackets 42 , 43 are oriented perpendicularly to the longitudinal direction 11 and face each other. On the stop surface 44 of the first stop angle 42 is fastened a hydraulic cylinder 47 whose piston rod 48 is displaceable in the longitudinal direction 11 . Instead of the hydraulic cylinder 47, a mechanical drive, in particular an electric cylinder, can also be provided, for example equipped with a particularly high load-carrying planeta...

technical field

[0001] The invention relates to a method for producing a lead screw. Background technique

[0002] From DE 10 206 744 B4 it is known to manufacture a threaded screw by the thread rolling method. In this case, a blank extending in the longitudinal direction is provided on its outer circumference substantially over its entire length with at least one helical groove in which the balls of a ball screw drive, for example, can run. After rolling the thread, the blank is typically machined in order to produce a bearing bearing point for a radial rolling bearing or a transmission journal for connecting an electric motor or a transmission at the end.

[0003] The maximum diameter of the bearing support portion and the transmission journal is limited by the root diameter of the helical groove. In this case, it is possible that the achievable diameter of the radial rolling bearing or of the transmission journal is not sufficient to permanently transmit the loads occur...

Examples

Embodiment Construction

[0027] figure 1 A side view of a schematically simplified illustration of a device 40 for carrying out the method according to the invention is shown. The device 40 includes a solid base frame 41 which extends parallel to the longitudinal direction 11 of the blank 12 . A first and a second identical stop angle bracket 42 , 43 are fastened on the base frame 41 in a position-adjustable manner in the longitudinal direction 11 , so that the device 40 can be adapted to different lengths of the blank 12 . The flat stop surfaces 44 of the stop angle brackets 42 , 43 are oriented perpendicularly to the longitudinal direction 11 and face each other. On the stop surface 44 of the first stop angle 42 is fastened a hydraulic cylinder 47 whose piston rod 48 is displaceable in the longitudinal direction 11 . Instead of the hydraulic cylinder 47, a mechanical drive, in particular an electric cylinder, can also be provided, for example equipped with a particularly high load-carrying planeta...

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