RU2451570C1 - Method of producing variable-corrugation elements - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to construction and may be used for production of variable-corrugation metal and nonmetallic sheet straight and curved elements. Billet is clamped between rotating female die and male die selected from different-gage and/or different-form male dies to match female die. Replacement or male and female dies does not require outage of process line.

EFFECT: higher efficiency of processing, expanded performances.

1 dwg

Description

The invention relates to the construction and can be used for the manufacture of alternating corrugated sheet metal and non-metallic elements of a rectilinear (wall of beams and columns) and curvilinear (wall of arches and supporting contours) outlines.

Under the variable corrugation is meant mainly transverse (perpendicular to the longitudinal axis) corrugation of the sheet blank-element with corrugations with a height, and / or step, and / or profile. A single corrugation along its length can be constant or variable (i.e., wedge-shaped or in the form of a half truncated cone) section. The corrugation can go out on both (both) faces (edges) of the element, only one face can not go out on the edges of the element at all - the so-called “deaf” corrugation. The corrugations can be one-sided or bilateral with respect to the median plane of the element.

A known method of traditional corrugation of sheet metal billets by rolling between rolls rotating towards each other (Metal structures. 3 vol. T.1. Structural elements: Textbook for constructs, universities / V.V. Gorev, B.Yu. Uvarov, V.V. Filippov et al .; Edited by V.V. Gorev. - 3rd ed. Eras. - M .: Higher school, 2004. - 551 p .; ill. P.296).

Traditional corrugation implies the constancy of the parameters of the corrugations within a particular element.

From the level of technology (Romanovsky V.P. Handbook of cold stamping. - 6th ed., Rev. And add. - L .: Mechanical engineering. Leningrad. Department, 1979. - 520 p., Ill. P. 51 ) a method for bending metal workpieces is known. This method consists in the elastoplastic deformation of the sheet metal due to its pressing between the matrix and the punch.

The closest in technical essence and purpose is known from the prior art tool (RU 2199409 C2, B21D 13/06, B21D 5/06, 02/27/2003) - "Profiling device". This device implements a method of corrugating sheet elements using forming a wavy profile of elements mounted on an endless chain transmission, and supporting elements. According to the description of the known means, the levers forming a wave-like profile can move relative to an endless chain transmission perpendicular to the plane of the supporting levers when they are opposite the said plane. The result of using the closest analogue is a corrugated sheet with a regular or irregular arrangement of corrugations. In the latter case, the surface of the material obtained at the outlet of the device is alternating two waves and a flat section.

The disadvantage of these methods is the static parameters of the corrugations obtained in the process of corrugating the element, i.e. these methods do not allow to obtain variable corrugation at the output without stopping the process and forming elements.

The technical result from the use of the proposed method lies in the possibility of a continuous automated process of corrugating elements with corrugations with variable geometric parameters.

The presented result is aimed at solving the following problems: rational consumption of materials, ensuring high productivity, production of elements of optimal structural forms.

The specified technical result is achieved due to the fact that the stamping mill uses a rotating matrix containing grooves of different caliber and / or profile, and a set of interchangeable multi-caliber and / or multi-profile punches corresponding to the grooves of the matrix. In this case, the change of the forming elements forming the corrugations is carried out in the process of corrugating the workpiece, i.e. without stopping the production phase.

The use of variable-corrugated elements in the technique (primarily the walls of building structures) allows to reduce the material consumption of structures due to the rational distribution of the material and increase their strength resistance to loads and influences.

The invention is illustrated by the figure, which shows a diagram of a stamping mill that implements a method of manufacturing a variable-corrugated sheet elements. The diagram shows: 1 - blank; 2 - feed rolls; 3 - receiving rolls; 4 - pinch rolls; 5 - a punch; 6 - cassette with a set of miscellaneous punches 5; 7 - the feed mechanism of the punches 5; 8 - pusher punch 5; 9 - a rotating matrix with a set of different-sized grooves; 10 - reference base of the matrix 9; 11 - matrix shaft 9 connected to the rotor and resting on saddle-shaped pushers; 12 - retractable support plate of dielectric material for the punch 5 at the time of replacement of the caliber; 13 - lifting pushers.

The proposed method is as follows:

- the formation of blanks 1 of the required dimensions, subject to amendments for subsequent corrugation;

- transfer of the workpiece 1 to the stamping mill;

- feeding the workpiece 1 to the die 9 and punches 5 by means of feed rollers 2 and pressure rollers 4;

- installation of the matrix 9 to obtain the desired caliber and / or profile (due to the rotation of the shaft 11) of the corrugation and the selection of the corresponding punch 5 from the cartridge 6 (due to the feeding mechanism 7);

- clamp the workpiece 1 to the matrix 9 and the punch 5 due to the pusher 8;

- calibrating blind thrust through the punch 5 for a snug fit of the workpiece 1 to the matrix 9 and the punch 5 in order to obtain a given profile geometry;

- return of the punch 5 to the starting position;

- raising the workpiece 1 with the help of lifting pushers 13;

- transfer of the workpiece 1 to the receiving rolls 3;

- change (if necessary) the profile and / or caliber of the groove of the matrix 9 and the corresponding punch 5;

- repetition of the molding cycle.

At the time of molding, the matrix 9 is supported by the support base 10. The rotation of the matrix 9 is carried out by the shaft 11 connected to the rotor and supported by saddle-type pushers, which allow the matrix 9 to be lifted (together with the shaft 11) at the time of its rotation.

The pusher 8 of the punches 5 is driven by a crank hydraulic other mechanism.

With relatively small thicknesses of the corrugated element (preform 1) and / or a corrugated profile of the corrugations, as well as in the case of easily deformable material of the preform 1, there is no need for a dull calibration shock. It seems that in some cases, a sufficiently large clamping force will ensure a snug fit of the workpiece 1 to the forming elements (matrix 9 and punches 5) and without a gauge blind thump. For some corrugation profiles (for example, a rectangular one), a gauge thud can lead to jamming at the lower point, which is described in the book: Romanovsky V.P. Handbook of cold stamping. - 6th ed., Revised. and add. - L .: Mechanical engineering. Leningra. Department, 1979.- 520 s, ill. S.53.

Thus, the implementation of the proposed method without the operation of a dead-end gauge is generally possible.

At the time of replacing the punch 5, in order to prevent it from falling out, a support plate 12 is advanced, which can be made of dielectric material if the punch 5 is attached to the pusher 8 by means of an electromagnet.

The movement of the punches 5 in the cassettes 6 is carried out using the feed mainly hydraulic mechanism 7.

For synchronization and coordinated operation of mechanisms in the proposed method, it may be effective to use numerical program control (CNC) using a computer.

A distinctive feature of the proposed method is a continuous automated corrugation of the workpiece 1 using a rotating matrix 9 and a set of interchangeable punches 5. Moreover, the change of calibers and / or profiles of the punches 5 and the rotation of the matrix 9 occur without stopping the corrugation process.

The result of using the proposed method is a variable-corrugated element in which both the pitch and / or height of the corrugations and their profile can vary

The presented method is oriented, first of all, to transverse corrugation of elements, i.e. the corrugations are perpendicular to the longitudinal axis passing along the largest side of the element.

Features of the application of this method are the need to take into account the deformation of the workpiece 1 in the corrugation process; thinning and changes in the elastoplastic properties (for metals, hardening) of the material of the element, primarily in the places of inflection; elastic springing of the workpiece 1; minimum radii of curvature. These features can be taken into account by methods known in the stamping technique.

The preform 1 can be heated before the stamping process to improve plastic properties and reduce internal stresses. It is rational to coordinate the temperature regime of stamping with the temperature regimes of other operations, for example, with the temperature of heating elements during the welded connection of the belts and the wall of the beam or parts of the wall to each other. Differentiated heating of the workpiece 1 is justified: sections of the workpiece 1, on which corrugations with relatively greater rigidity will be located, i.e. small steps and large heights, as well as corrugations, whose profile suggests a sharp change in the direction of the sheet (triangular, trapezoidal and others with pronounced faces) are subjected to a greater intensity of temperature exposure in order to better ensure the required deformations.

The speed mode of advancement of the workpiece 1 through the stamping mill may be irregular. So, for example, a change in caliber or corrugation profile, i.e. rotation of the matrix 9 and the selection of the corresponding punch 5 may require a decrease in the feed rate of the workpiece 1.

Material properties of stamping tools (primarily the punch 5 and die 9) are assigned taking into account generally accepted requirements in the stamping technology.

The side of the workpiece 1, facing the matrix 9, or the working surface of the matrix 9 can be greased to facilitate removal of the workpiece 1 from the matrix 9.

Claims (1)

A method of corrugating elements to obtain corrugations with variable geometric parameters, including feeding the workpiece to the punch and the matrix and pressing the workpiece between the matrix and the punch, characterized in that the geometric parameters of the corrugations are varied using a rotating matrix containing grooves of different sizes and / or profiles, and a set of interchangeable miscellaneous and / or multidisciplinary punches corresponding to the grooves of the matrix, moreover, changing the profile and / or caliber of the groove of the matrix by rotating it and the corresponding uansona performed without stopping the shirring process.

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