RU2510301C2 - Standless sheet bending mill for making channeled sheets - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and can be used for making channeled sheets for light metal structures. This comprises two vertically-looped pull chains arranged at its edges, their hinges being composed of rollers designed to interact with top stationary idle counter rollers for edge contouring. Note here that channeling forming elements are arranged between top braches of the chain and composed of idle flutes made up of self-lubing antifriction metal-graphite composite.

EFFECT: lower metal input.

3 dwg

Description

The invention relates to the field of metal forming and can be used for the manufacture of corrugated sheet profiles.

Known bezletovoy roll forming machine for the manufacture of corrugated profiles, containing converging along the profiling of the lower and upper guides, vertically closed traction chains, the hinges of which, arranged in the form of rollers, rolls, serve as driving profiling elements, which when they roll on treadmills in the lower guides have the possibility of profiling interaction with batteries of non-drive forming elements in the form of control rollers stationary installed in the upper rails. Moreover, treadmills in the lower guides are provided with an antifriction coating (patent 2312726, bull. No. 35, 2007).

The disadvantage of this known bezkletovoy mill is the high consumption of materials and the complexity of the manufacture of vertically closed traction chains with sprockets and a large number of profiling rollers, rollers with rolling bearings and even more numerous upper stationary forming rollers in batteries. Accordingly, operating costs also increase.

An object of the invention is to reduce the cost of manufacture and reduce the cost of operating a bezkletovoy roll forming mill by reducing its metal consumption and machine-intensive production and repair work.

The solution to this problem is achieved by the following claimed combination of essential features having constructive novelty relative to the well-known mill according to patent No. 2312726:

- the proposed mill contains only two vertically closed traction chains with hinges in the form of roller rollers moving in the lower guides installed along the edges of the mill equidistant from its longitudinal axis, while the roller rollers in the hinges of these chains serve as drive edge profiling elements in cooperation with batteries of stationary non-drive rollers mounted above them with shaped rims providing reliable locking jamming of the edges of the sheet blank;

- corrugating upper and lower forming elements located between the upper branches of the traction chains, are non-driven in the form of straight, converging in terms of prefabricated skids made of antifriction metallographic composite material, for example, from the nomenclature of iron-copper graphite grades Zh1r1D3, Zh1r2D2.5 [1] or other composites; while the runners are composed of individual fragments of inserts, which are affixed and fixed in the upper and lower guide rails.

Figure 1 shows the proposed mill - the main view, figure 2 schematically a section aa in figure 1, figure 3 section bB in figure 2.

The mill consists of a bed 1, vertically closed traction chains 2 with hinges in the form of edge profiling rollers 3, drive sprockets 4 with drive 5, side lower guides 6 with treadmills 7 made of antifriction material, side upper guides 8 with fixed mounted on them batteries of non-drive rollers 9 with shaped rims (except for several smooth on the fueling section of the mill), the upper 10 and lower 11 guide rails with the upper 12 and lower 13 corrugated skids fixed in them. Both vertically closed chains 2 are provided with individual tensioning sprockets 14. The upper lateral guides 8 and the guide rails 10 are connected by transverse beams 15, which are connected to the frame 1 by mounting pins 16 with fixing nuts 17.

Roll mill works as follows.

The beginning of the workpiece is taken on rollers-rollers 3, located at the upper points of the tensioning sprockets 14 with an institution for the first non-driven rollers 9 displaced forward. begin to rotate due to adhesion with them, creating, in cooperation with the rollers 9 mounted above them, a pulling force to advance the workpiece forward, simultaneously profiling the edges and corrugations in the runners 12 and 13. In this case, the interaction gap the angle between the rims of the rollers 3 and 9 should be equal to the thickness of the sheet stock minus the mandatory “tightness” within the elastic deformation of the workpiece material in compression. The specified "tightness" creates the necessary normal pressure P, the same in three lines of dynamic contact of the rims of the rollers with the surfaces:

- rollers-rollers 3 with a friction treadmill and the lower surface of the profiled workpiece;

- non-driven rollers 9 with the upper surface of the workpiece.

Due to this, three moments of rolling friction forces arise simultaneously:

- относительно поверхности беговой дорожки;

- relative to the surface of the treadmill;

- относительно нижней поверхности листовой заготовки;

- relative to the lower surface of the sheet stock;

- относительно верхней поверхности листовой заготовки;

- relative to the upper surface of the sheet stock;

,

,

, где

,

,

where

P is the normal pressure force of the rims of the rollers on the rolling surface (for stationary rollers 9 - relative rolling);

f ₁ - dry friction coefficient of rolling along the friction track;

f ₂ - dry rolling friction coefficient on the surfaces of the sheet stock;

D is the diameter of the roller rollers 9;

d is the diameter (reduced) of the control rollers 9 with shaped rims.

It is the combined combination of these three points with the variation of three variable parameters - f ₁ , D and d - that ensure the rotation of the edge-forming rollers 3 and 9 with the transfer of traction forces to advance the sheet stock in the profiling direction without slipping with the simultaneous formation of corrugations in runners 12 and 13

The technical result of the invention is to reduce the cost of manufacture and reduce the cost of operating a bezletovoy roll forming mill by reducing the metal consumption and machine-intensive production and repair work.

Literary sources on the links in the description:

1. V.D. Zozulya. Greases for sintered self-lubricating bearings. - Kiev, Naukova Dumka, 1976, p. 8, 10, table 3.

Claims (1)

A bezletless roll-forming mill for the manufacture of corrugated profiles, containing lower and upper guides converging along the profiling, vertically closed traction chains, the hinges of which are arranged in the form of roller rollers moving in the lower guides along treadmills with antifriction coating, which have the possibility of profiling interaction with stationary mounted above them non-driven rollers in the form of batteries on the upper rails, characterized in that it contains two vertically closed traction e chains, and their roller rollers are mounted with the possibility of moving in the lower side guides located along the edges of the mill equidistant from the axis of symmetry of its profiling part, non-drive rollers are installed above the roller rollers and in cooperation serve to profile edges and transfer traction forces to promote sheet blanks in the direction of profiling, and non-driven corrugating profiling forming elements are located between the upper branches of the traction chains and are made in the form of fixed in the upper and lower heads rushing-clips of runners from self-lubricating antifriction metallographite composite material recruited from insert fragments.

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