RU2398663C2 - Shaped sheet cutter - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and can be used for transverse cutting of shaped steel. Proposed device comprises bed supporting lower stationary knife that serves to support shaped sheet so that shaped ledges get aligned and upper movable knife secured at top part of the device. Top knife consists of two parts with their cutting lines equally inclined at α =(1.5-3)° to horizontal line of lower stationary knife to make cutting start moment coincide with moment of contact between RH and LH of upper and lower knives and make cutting termination moment coincide with passing of scissors upper knife central part through lower knife central part.

EFFECT: higher quality, simple design.

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Description

The invention relates to the processing of metals by pressure and can be used in mechanical engineering for transverse cutting of profiled steel.

The famous "Set of scissor knives", ed. Kuvshinnikov O.A. and others (AS No. 2209710, B23D 35/00). It consists of a bed, upper and lower knives, convex elements, protrusions with the edges of the shaped profile.

Disadvantages: the geometry of cutting is provided by parallel lines of the upper and lower knives, with the vertical direction of cutting by the upper knife while touching the upper and lower blades in parallel sections, and the destruction of the profiled sheet in sections with curvatures is achieved simultaneously along the cutting line, stressful cutting conditions occur in elementary horizontal sections .

Also known are “Electromagnetic Scissors”, ed. V.A. Tagirov and V.P. Rychagov (A.S. No. 482287, Bulletin No. 32 dated 08.30.75, B26D 5/06, B23D 15/12). Scissors contain a bed, fixed and movable parallel knives located horizontally, a cross-arm, other details and mechanisms, electrical equipment to ensure their operation.

Disadvantages: complex device.

Also known is the "Tool of parallel scissors", the authors Dyshlevich V.F. and others (RU No. 2039638 from 07.20.95), intended for cutting profiles of a trough-shaped section. The tool contains the upper, movable and lower fixed knives mounted on the bed.

Disadvantages: complex device.

It is also known "Device for cutting sheet material", ed. Isakov A.V. etc. (RU №2102200 from 01.20.98), containing a bed, roller and adjustable supports, spring dampers, guides, upper knife holder, holder caliper, lower knife, guides and pressure plates, electric motor, caliper displacement drive, supports, eccentric shaft, bearing bearings, worm shaft, worm wheel, adjustable sidewalls, couplers, frame reverse gear unit, block, counterweight, nuts.

Disadvantages: complex device.

The prototype of the present invention adopted "Device for cutting sheet material", ed. Isakov A.V. etc. (RU №2102200 from 01.20.98), containing a bed, roller and adjustable supports, spring dampers, guides, upper knife holder, holder caliper, lower knife, guides and pressure plates, electric motor, caliper displacement drive, supports, eccentric shaft, bearing bearings, worm shaft, worm wheel, adjustable sidewalls, couplers, frame reverse gear unit, block, counterweight, nuts.

Disadvantages: a complex device, not intended for cutting a profiled sheet.

The technical task of the device for cutting a profiled sheet is to provide cutting with the simplest equipment when processing a profiled sheet. The technical problem is achieved by using a horizontal, stationary, straight knife in the lower part for laying a profiled sheet with profile protrusions and an upper movable knife with profile protrusions, consisting of two knives equally inclined to the horizontal line, providing cutting of the profiled sheet, and the lower part of the fixed knife is fixed to bed of scissors, the movable part of the upper knife is connected with the bed with the possibility of raising and lowering the upper knife.

The proposed device comprises a horizontal knife with profile protrusions 1, traditionally fixed on the bed 2 of the cutting device, and two parts of the movable knife with its inclination to the horizontal line of the lower parts of the upper profile projections 3, fixed in the upper part 4 of the cutting device with the mismatch of the cutting line with the cutting line the lower knife at an angle α (Figs. 1 and 2), while the upper knife is made of two parts, the cutting lines of which are equally inclined at an angle α = (1.5-3) ° to the horizontal line of the lower fixed knife from the condition the effect of the coincidence of the start of cutting with the beginning of touching the right and left parts of the upper and lower knives and the coincidence of the end of cutting with the passage of the middle part of the upper knife of the middle part of the lower knife of the knives,

Concrete example

With the upper position of the movable knife 3, the profiled sheet is laid on the lower, stationary knife 1 with the coincidence of the profile protrusions. After the lowering mechanism of the upper knife 3 is turned on by the upper movable part 4, the sheet is cut, and the sheet is kept from shifting (from slipping) due to friction at the contact points of the movable and fixed knives, i.e. at the points of destruction of the profiled sheet, as well as the persistent reaction of the profiles of the sheet in the response points of the profiled protrusions of the fixed knife.

When using a device for cutting a profiled sheet, the quality of the product increases (the absence of tears, jams, barbs), the design of scissors is simplified.

Claims (1)

A device for cutting a profiled sheet containing a bed, a fixed fixed knife fixed thereon, intended for laying on it a profiled sheet with matching profile protrusions, and an upper movable knife fixed in the upper part of the device, while the upper knife is made of two parts, cutting lines which are equally inclined at an angle α = (1.5-3) ° to the horizontal line of the lower fixed knife, ensuring that the moment the cutting starts coincides with the start of touching the right and left parts of the upper and lower knives and the matching the point of the end of cutting with the passage of the middle part of the upper knife of the middle part of the lower knife of the scissors.

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