RU2462348C2 - Sector knife - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to sizing of materials. Proposed knife is incorporated with cutting device including two anvil-type knives each arranged to interact with knife cutting element, and comprises two cutting elements and elastic insert fitted between said cutting elements.

EFFECT: decreased steel intensity, longer life.

9 cl, 2 dwg

Description

The present invention relates to the field of material processing, and in particular to devices for cutting sheet corrugated cardboard.

BACKGROUND

Currently, slotters are used in the manufacture of products from sheet corrugated cardboard for cutting sheets of corrugated cardboard. The working bodies of the slot 1 are the sector knife 2 and the counter-knife 3. The sector knife 2 is mounted on the knife coupling of the shaft 4 of the sector knife. Counter-knives 3 are mounted on a knife shaft coupling of 5 counter-knives. Thus, when the shafts rotate towards each other, the sector knife 2 periodically falls between the counter-knives 3, whereby a notch having the required length and width appears on the sheet 6 of the material being processed between the knife couplings.

The closest analogue for the sector knife, according to the present invention, is a sector knife for cutting / perforation on a corrugated cardboard, presented in the catalog of the company Class Engineering, available on the Internet at http://classeng.com/knives-sect. html

For high-quality cutting, it is necessary to ensure high precision manufacturing of the knife with a given thickness tolerance, as well as high precision installation of the sector knife in the slotter so that the working surfaces of the sector knife and the counter-knives are parallel and do not touch each other (tolerance of the order of 0.02 mm ) During operation, when the working surfaces of the sector knife and the counter-knife wear out, the gaps between the knives increase, which prevents high-quality cutting of the processed material. At the same time, the sector knife is not subject to re-sharpening, since it will cause an even greater increase in the gap. To increase the wear resistance of the sector knife, according to the prototype, the knife is entirely made of high alloy hardened steel. To improve the quality of cutting, a gear sharpening is additionally applied to the cutting edge of the sector knife.

Thus, the disadvantages of the sector knife, according to the prototype, are:

high metal consumption;

high manufacturing complexity associated with high demands on the quality of the metal, precision machining (for manufacturing it is necessary to apply turning, milling, grinding, apply gear sharpening, etc.);

high installation complexity associated with high requirements for the accuracy of installation of a sector knife;

short service life.

The challenge faced by the author of the present invention was to create a sector knife easier to manufacture and install, less metal-intensive, and also with a longer service life.

SUMMARY OF THE INVENTION

The technical result of the claimed invention is to simplify the manufacture of a sector knife, simplify the procedure for its installation, reduce the metal consumption of a sector knife, as well as increase its service life.

To achieve the claimed technical result as a sector knife, it is proposed to use a knife consisting of

two cutting elements;

elastic insert between the cutting elements.

At least one cutting element may be made in the form of a plate.

Unlike the prototype, in which the knife is manufactured and installed so as to provide a gap between the working surfaces of the knife and the counter-knife, the knife according to the present invention can be made known to be thicker than the gap between the counter-knives. When cutting, the knife by deforming the elastic insert assumes a thickness equal to the gap between the counter-knives.

This reduces the requirements for precision manufacturing of the knife, eliminates the need for costly processing in the manufacture. The procedure for making a knife is simplified.

In addition, due to the spontaneous adjustment of the cutting surfaces to each other at the entrance of the sector knife between the counterknives, the requirements for the accuracy of installation of the sector knife on the shaft of the sector knife are reduced.

The decrease in metal consumption of the product according to the present invention is associated with filling the space between the cutting elements with an elastic insert, in contrast to the prototype, which according to the prototype consisted entirely of high alloy steel.

The working surface of the cutting elements in the process of grinding, while sharpening it on one side, which is opposite to the surface interacting in working condition with a counter knife, the cutting element is spontaneously sharpened. As the working surface of the cutting elements is ground during operation, the deformed elastic insert, pressing the cutting elements to the surface of the counter-knives, prevents the formation of a gap between the working surface of the cutting element and the corresponding counter-knife. This increases the service life of the knife and the quality of the cut.

Next, a description will be given of the claimed invention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 depicts a diagram of the operation of the slot.

Figure 2 depicts the design of the knife according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The knife 2 according to the present invention contains

two cutting elements 7;

elastic insert 8 between the cutting elements 7.

The cutting elements 7 can be made in the form of plates. The plates can be made of alloy steel by any of the known methods, for example by stamping, laser cutting, electroerosion, waterjet and others. Also, the plates can be hardened to the required hardness. At least one cutting element 7 can be sharpened on one side that is opposite to the surface interacting in working order with the counterknife 3, that is, in the case where the cutting elements are plates, on the side by which the cutting element 7 is connected to the elastic insert 8.

The elastic insert 8 may be made of rubber, soft plastics, composite synthetic materials, foamed synthetic materials or other materials with suitable mechanical properties.

The assembly of the knife 2 can be carried out by any of the known methods, for example, by gluing, vulcanizing or molding composite plastics.

Knife 2 must be made obviously thicker than the gap between the counter-knives so that the knife during operation falls into the gap between the counter-knives 3 with an interference fit. For unhindered entry of the knife 2 between the counter-knives 3 in the place of the initial entry of the knife 2 into the gap between the counter-knives on the cutting elements, chamfers 9 can be performed.

For cutting the end face of the notch, the knife may contain an end cutting element 10. The end cutting element 10 can be made in the form of a steel plate, embedded in the assembly of the knife 2 with the material of the elastic insert 8 so that the cutting edge of the end cutting element 10 is essentially perpendicular to the planes, in which the cutting edges of the cutting elements 7 lie.

In addition, a part of the cutting element 7 can be made as an end cutting element. For this, at least one of the cutting elements 7 comprises a part bent so that its cutting edge is essentially perpendicular to the cutting edge of the cutting element 7, thereby forming end cutting element 10.

To attach the knife 2 to the shaft 4 of the sector knife by means of a knife coupling, the knife 2 additionally contains through mounting holes 11. To prevent unwanted punching of the knife 2 when mounted in places of the mounting holes 11, the elastic insert 8 along the periphery of the mounting holes 11 may contain less elastic material, for example, hard plastic or metal.

The knife 2 is made wider than the gap between the counter-knives 3. In the process of turning the shaft 4 of the sector knife, the knife 2 is tightened into the gap between the counter-knives 3, rotating on the shaft 5 of the counter-knives. Thanks to the elastic insert, the knife 2, deforming, takes a thickness equal to the size of the gap between the counterknives 3.

During use, the outer surfaces of the knives 2, interacting with the counterknives 3, grind, and, thanks to the sharpening of each of the cutting elements 7 on the one hand, the opposite surface interacting in working condition with the counterknife 3, spontaneous sharpening of the cutting elements 1 occurs. In this case, the elastic insert 8 prevents gaps between the knife 2 and the counter-knives 3.

Claims (9)

1. A knife designed to work as part of a cutting device, which also has two counter-knives, each of which is made and arranged to interact in working order with the cutting element of the knife, characterized in that it contains two cutting elements and an elastic insert between mentioned cutting elements. 2. The knife according to claim 1, characterized in that at least one cutting element is made in the form of a plate. 3. The knife according to claim 2, characterized in that the plates are made of metal. 4. The knife according to claim 1, characterized in that at least one of the cutting elements is sharpened on one side, which is opposite to the surface interacting in working condition with a counter-knife. 5. The knife according to claim 1, characterized in that at the place of the initial entry of the knife into the gap between the counter-knives on the cutting elements, bevels are made. 6. The knife according to claim 1, characterized in that the knife further comprises an end cutting element, the cutting edge of which is essentially perpendicular to the planes in which the cutting edges of the cutting elements of the knife lie. 7. The knife according to claim 6, characterized in that the end cutting element is made in the form of a plate. 8. The knife according to claim 1, characterized in that the knife further comprises through mounting holes. 9. The knife of claim 8, characterized in that the elastic insert along the periphery of the mounting holes of the knife further comprises a less elastic material.

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