SU910291A1 - Mandrel for winding springs and spring parts - Google Patents

Description

(5) FRAMEWORK FOR SPRING AND SPRING

DETAILS

I

The invention relates to the processing of wire and the manufacture of products from it, in particular, to devices for the manufacture of screw springs and wire spring parts.

Mandrels for hot and cold winding of coil springs are known, which are smooth solid rods or solid rods with screw thread 1. These mandrels contain a working forming part and TAILS 41K.

Solid mandrels can be used for winding springs that are simple in shape, for example cylindrical and conical. For coiling the same. shaped springs, for example rhombic, barrel-shaped, and other, with a diameter of varying length, known mandrels are inapplicable, since the wound spring cannot be removed from the mandrel.

Mandrels for the manufacture of helical micro Springs, made of elastic material 12, are known. The data are removed from the wound spring by immersing it with a spring in a composition, a solvent elastic material.

On such mandrels it is possible to manufacture springs of any shape.

Such mandrels are rational to use in the manufacture of micro Springs in small-scale production. In the manufacture of springs of relatively large diameter, the consumption of elastic material going to the manufacture of mandrels increases dramatically. In addition, the features (properties) of the material from which the similar mandrels are made do not allow heat treatment of the springs directly on the mandrel and do not provide sufficient accuracy of the size of the springs in diameter.

M

Claims (3)

Mandrels for winding biconical springs and the like are also known. hot wire, consisting of at least two parts, articulated, forming the framework of the desired profile. Both ends of the mandrel are mounted on shafts, at least one of which can move in the axial direction. In the working position, the frame expands in the transverse direction and takes the desired shape, while in its initial position it has a cylindrical shape that allows you to remove the wound spring 3. The disadvantage of such mandrels is the complexity of their manufacture, as well as the small rigidity of the frame limiting length of wound springs. The purpose of the invention is to simplify the design of the mandrel and to expand the range of springs and spring parts manufactured by winding wires onto the mandrel by allowing the winding of figured springs and spring parts of any form. This goal is achieved by the fact that in the mandrel for winding a spring and spring parts containing a working working forming part and a core, a working forming part is made of a set of disks mounted on the core forming a surface with a profile - corresponding to the profile of the wound spring. The thickness of the discs is less than the pitch of the coiled spring. FIG. 1 schematically shows a mandrel; in fig. 2 - the cross section of the mandrel in the plane of the winding; in fig. 3-6, some types of figured springs that can be made on the proposed mandrel. The working formative part is a set of discs 1 installed in a certain sequence on the core 2 and fixed with the help of a nut. 3- The outer surface of each disc is formed along a profile the junction of all disks surface corresponding to the profile of the resulting spring. On the collar of the core 2 there is a slot 4 for fastening the wire. To prevent the discs from turning on the core during winding of the spring, they are attached to the core with a spline connection. The thickness of the discs is less than the pitch of the coiled spring, so that they can be removed from the spring to the light between the coils. A spring guide for the proposed mandrel is manufactured as follows. A set of discs 1 forming a profile corresponding to the profile of a windable spring is mounted on the core 2 in a specific sequence and fastened with a nut 3- The assembled mandrel is inserted into the device for manual winding of the spring or into a specially adapted lathe, the end of the wire is fixed in the slot C and the spring is wrapped (in figs. 1, 2 it is shown conditionally). After winding the mandrel together with the spring is removed from the fixture or lathe, unscrew the nut 3 and remove it from the mandrel. At the same time, the working forming part of the mandrel disintegrates into separate discs that are removed from the spring into the gaps between the vitamins, then the discs are reassembled and fixed with a nut 3 on the core are secured with a nut 2. Other disks form a profile corresponding to the profile springable spring. Thus, the proposed breakaway mandrel allows you to wind curly springs of almost any shape, including rhombic, barrel-shaped and other (curly) springs with a variable diameter, which can not be removed from known solid mandrels. The proposed collapsible mandrels will provide significant metal savings, since it is necessary to manufacture only working (shaping) parts for winding different springs — the core is used the same. Is- The use of prefabricated mandrels will improve the accuracy of the manufacture of springs in diameter and provide the ability to manufacture springs / "of total length, unlike the known mandrels for winding biconical springs. Claim 1. Mandrel for winding springs and spring parts containing a composite working forming part. installed on the core, so that, in order to simplify the design of the mandrel and expand its technological capabilities by providing the possibility of winding curly springs of a wedge profile, the working forming part is made in the form of a set fixed on the core by the spline connection of the disks forming the surface with the profile corresponding to the profile of the spring to be twisted. 2. The mandrel according to claim 1, so that the disks mounted on the core are made with a thickness that is less than the pitch of the wound spring. Sources of information taken into account in the examination 1. Babanov M.V. Petrov I.V. Springs. M., Mashgiz, 1968, p. 57-60. 2. USSR author's certificate tf 222322, cl. In 21 F ZM, 1968. 3. The patent of Germany No. 2515 “6, cl. B 21 F 3/04, 1976 (prototype).