SU1230732A1 - Method of coiling springs - Google Patents

Description

The invention relates to mechanical engineering and can be used in all industrial sectors in the manufacture of cylindrical spring screws.

The purpose of the invention is to improve the quality of the springs by automatically ensuring the uniformity of the pitch of the working screws,

The drawing shows the scheme of the proposed method.

The measuring bar (workpiece) through the guide is fed at one end to the surface of the mandrel, which begins to rotate at the required speed, and the longitudinal support, a step-wise mechanism from the software, provides a step of preloaded turns (section 0-1 of the drawing). Upon reaching a predetermined number of podzhatymi coils from the software device, a signal is sent to winding the working screws; moreover, at the beginning of the loading of the working coil, not exceeding 1/4 of the coil (section 2-3 of the drawing), an additional displacement impulse the value of which is determined by the ratio

4irD

Where.

Qd

i i)

R

R

D.

D

- - spring pitch; average spring diameter; The diameter of the wire; elastic modulus; - coefficient characterizing the plastic draft of the wire during winding;

Editor T. Mitejko

Compiled by V. Buzhinsky

Tehred M. Khodanich Proofreader S. Shekmar

Order 2479/13

Circulation 655

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

-Production and printing company, Uzhgorod, Projecto st., 4

C - spring tension: torsional.

Then, the spring is wound with a step of working turns (section 4-5 of the drawing). Upon reaching a predetermined number of working turns from a software device, a signal is received to wind up preloaded turns. Moreover, at the end of the winding of the last working turn on a length not exceeding 1/4 part, an additional impulse of movement is given by the specified value uS (section 6-7 of the drawing) and above then the working feed, and only then winding up the preloaded turns (section 8 -9 drawings),

Entering such a pulse (L5) into the spring winding method eliminates the effect of redistributing the torsional deformation from the preloaded turns to the workers during the transition from one winding step to another. As a result, the pitch of the working turns of the spring is obtained 5 uniform (section about | - & Drawing).

As an example of the manufacture of the spring according to the proposed method, spring winding from wire J. 9.5 mm, the number of workers

five

0

turns hp 2.5, the number of turns full n 4.5, height H 50 mm and index C 3,5, for which the value of the additional pulse was U g 7.2 mm.

The winding of the springs according to the proposed method allows to obtain a uniform pitch of the working coils of the spring, which increases the durability of the springs due to a more uniform distribution

loads on coils and eliminates the need to edit the springs after winding and thereby reduces the complexity of their. manufacturing.

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Claims (1)

(56) METHOD FOR SPRING WINDING, comprising working and supporting coils, which consists in winding material onto a mandrel using a longitudinal support, which is subsequently informed of working movements corresponding to the pitch of the supporting and working coils, characterized in that, in order to improve the quality of the springs by automatic. ensuring the uniformity of the pitch of the working turns, at the moments of the beginning of the winding of the first working turn and the end of the winding of the last working turn, an additional impulse of movement is given to the longitudinal support over the working feed and 'take it off after winding no more than 1/4 of the length of these turns, at the value of the working increment will be determined from the ratio of this cottage where 5 „- step of the winding spring; G is the average diameter of the spring; <3 - wire diameter; G is the modulus of elasticity; p is the coefficient characterizing the plastic draft of the wire during winding ·, £ is the spring stress during torsion.