SU956183A1

SU956183A1 - Method of producing bimetallic disk saws

Info

Publication number: SU956183A1
Application number: SU802987535A
Authority: SU
Inventors: Юрий Васильевич Клименко
Original assignee: Всесоюзный Научно-Исследовательский Инструментальный Институт
Priority date: 1980-10-02
Filing date: 1980-10-02
Publication date: 1982-09-07

Description

1one

Изобретение относитс к области технологии инструментального производства биметаллического режущего инструмента.The invention relates to the field of technology for the instrumental production of bimetallic cutting tools.

Известен способ изготовлени дисковых пил, при котором изготавливают из листовой стали (быстрорежущей ) венец, а из конструкционной стали ступицу и соедин ют их электродуговой сваркой ij .A known method of manufacturing circular saws, in which a crown is made of sheet steel (high-speed) and a hub of structural steel, is joined by their electric arc welding ij.

Способ обеспечивает изготовление дисковых пил, имеющих разное с цельными количество переточек.The method provides for the manufacture of circular saws with different number of whole regrindings.

Недостатком способа вл етс низка производительность.The disadvantage of this method is low productivity.

Ограничение примен емости этого способа по толщине дисковых пил объ сн етс тем, что дл осуществлени его необходима двухсторонн разделка фасок и сварка двум кольцевыми швами. При толщине дисковых пил менее 10 мм этот способ сопровождаетс недопустимым короблением пил, которое не устран етс рихтовкой илиThe limitation of the applicability of this method to the thickness of the circular saws is due to the fact that in order to carry it out, two-sided chamfering and welding with two circumferential seams are necessary. When the thickness of circular saws is less than 10 mm, this method is accompanied by unacceptable warpage of saws, which is not eliminated by straightening or

Требует больших .трудозатрат на рихтовку . Низка производительность способа объ сн етс необходимостью сварки двух кольцевых швов с обеих сторон дисковой пилы.Requires a lot of. Labor on straightening. The low productivity of the process is due to the need to weld two ring seams on both sides of the saw blade.

Целью изобретени вл етс повышение производительности изготовлени биметаллических дисковых пил.The aim of the invention is to increase the productivity of the manufacture of bimetallic circular saws.

Поставленна цель достигаетс тем, что по предложенному способу ступи- The goal is achieved by the fact that according to the proposed method,

10 цу выполн ют с меньшим наружным диаметром , чем внутренний диаметр венца на величину 2,Ц-3,2 толщины венца, располагают их концентрично с зазором на поверхности электропроводного 10 tsu is made with a smaller outer diameter than the inner diameter of the crown by 2, C-3,2 thickness of the crown, they are arranged concentrically with a gap on the surface of the electrically conductive

15 плоского диска, на котором выполнена кольцева канавка, противолежаща зазору между венцом и ступицей симметрично относительно зазора, а дно канавки выполнено в виде параболы, 15 of a flat disk on which an annular groove is formed, opposite to the gap between the crown and hub, is symmetrical with respect to the gap, and the bottom of the groove is made in the form of a parabola,

Claims

20 convexity facing the gap. The crown is connected to the hub by means of an intermediate element of structural steel having the form of a ring whose diameter over the centers of the cross section is equal to the outer diameter of the hub plus the width of the gap. The intermediate element is placed above the gap, pressed against the crowns of the crowns — and the hubs are made of electrically conductive material with a force whose magnitude is chosen from the calculation of 1.1-1.2 kg / mm of the gap between the crowns and the hub, and to the base and the punch current pulse with a duration of 0.8-1.5. c, the size of which is chosen on the basis of 40-60 mm of the area of the gap between the crown and the step. FIG. Figure 1 shows the state before the current pulse is turned on; in fig. 2 - state after the passage of a current pulse; in fig. 3 - bimetal disk saw after machining the side surfaces. FIG. a crown 1 of high-speed steel, hub 2 of structural steel, an electrically conductive disk 3, a groove k on the surface of an electrically conductive disk, an intermediate element 5 a punch 6 and a welding transformer are indicated. The method is carried out as follows. The crown 1 of the hub is mounted centrically on the surface of the electrically conductive disk 3, the intermediate element 5 is placed above the gap between the crown and the hub, pressed with the electrically conductive punch 6 and the current pulse is switched on. As a result of local heating of the edges of the crown and hub and the entire metal due to plastic deformation, the gap between the crown and hub is made when the edges of the edges are localized, and in contact with the convex bottom, the base groove is squeezed out in the gap between it and the lower corners of the crown edges. . The latter is necessary to remove the oxide films transported by the deforming metals outside the joint zone. This is a prerequisite for the formation of a metallic bond of metals when they are jointly deformed in a ductile state. As a result, the crown of the saw blade of high-speed steel and its hub of structural steel are connected to form a metal bond between them and the intermediate element. The machine time for the manufacture of a single circular saw is 1-2 seconds, i.e. 2, on the order of less than when using the prototype method. The method makes it possible to manufacture circular saws of arbitrarily small thicknesses. The proposed method were made bimetallic circular saws. The rim of high-speed steel RBM5 had an outer diameter of 1100 mm, an inner diameter of 70 mm. The hub of steel 50HFA had an outer diameter of 6.1 mm, an inner diameter of 20 mm. The diameter of the ring (the intermediate element is equal to 65 mm, the diameter of its resulting cross-section is equal to mm). The force applied to the punch was 2100 kgf, the current pulse duration was 1.5 s, and the current was 30 Ka. Thus, the proposed method allows to increase the productivity of manufacturing bimetallic circular saws. Claims The method of manufacturing bimetallic circular saws, according to which the crown is made of high-speed steel, the hub is made of structural steel and is joined together with one another, characterized in that, in order to increase the productivity of production, the hub is made with a smaller outer diameter than the inner diameter of size 2, k3, 2 of the crown thickness, they are arranged concentrically with a gap on the surface of an electrically conductive flat disk, on which an annular groove is made, opposite to the gap between the crown and stu pice symmetrically with respect to the gap, and the bottom of the groove is made in the form of a parabola, with an outlet facing the gap, the connection of the ring with the hub is carried out using an intermediate element of structural steel having a ring shape, the diameter of the cross-sectional centers equal to the outer diameter of the hub plus the width the gap, the intermediate element is placed above the gap, pressed to the edges of the crown and the hub by a punch of electrically conductive material with a force, the value of which is chosen at the rate of 1.1 1-2 kg / mm of gap area dy crown and the hub, and the base punch and the supply current pulse t dlitel5956183

nosti and, 8-1,5 s, the value of which is 1. The works of the State Union are chosen at the rate of 40-60 mm of the research laboratory of the gap between the crown and hub, cutting tools and electric welding. Sources of information, ki. ML Gosnauchtekhizdat, E, taken into account in the examination s, 153 (prototype).