RU2207228C2 - Band type machine for sawing hard-to-form materials - Google Patents

Abstract

FIELD: working metals and stone materials. SUBSTANCE: machine includes upper and lower curvilinear guides. On working surfaces of said guides band saw and its drive unit are mounted. Working surfaces of curvilinear guides are in the form of hydrostatic supports. EFFECT: possibility for increasing lifting force of lubricant layer between saw and guides, effective cooling of saw. 1 dwg

Description

 The invention relates to equipment for sawing difficult materials and can be used in metalworking and at enterprises processing stone.

 Band saws are widely used in various sectors of the national economy for sawing wood, metal, stone, plastics, etc. They found the greatest application in sawmilling when sawing logs into lumber and thick lumber into thinner ones.

 The designs of band saws used in the sawmill industry are given on page 23 in the book of G.F. Prokofiev "Intensification of wood sawing with frame and band saws." - M .: Forest industry, 1990. - 240 p. Band saws have a driving and driven pulleys, on which a band saw with tension is put on. Band saws have the following advantages over other types of machines for sawing materials: a small width of cut, a slight roughness of the processed surface, the absence of large inertia forces.

 Disadvantages of band saws: low precision cutting at high feed speeds, low durability of saws, large overall dimensions and metal consumption.

 The main advantages of band saws are achieved in that the saw, made in the form of a thin endless steel strip, moves in one direction at high speed along two supports located above and below the material being sawn.

 The main disadvantages of band saws of a traditional design with saw pulleys are caused by the fact that these supports are rotating pulleys.

 It is necessary to create band saws of a new type that would preserve the advantages of band saws of a traditional design (the saw should be made in the form of a thin steel endless belt, held on two supports located above and below the material to be sawed, moved in the same direction at high speed), but not would have their drawbacks (machine tools should have no pulleys).

 The above task can be performed if the saw pulleys are replaced by curved guides located above and below the material to be sawn.

 The article by G. F. Prokofiev “Band saw with an air cushion saw” (Forestry, 2, 1994. - P.9-10) describes the design of a band saw where the saw moves along curved guides installed above and below the saw material. To reduce friction between the saw and the guides, the working surfaces of the latter are made in the form of aerostatic supports. When using a band saw with curved aerostatic guides, the accuracy of sawing and the durability of the saw are increased, the overall dimensions and metal consumption are reduced. Tests of a band saw with curved aerostatic guides showed its high efficiency when sawing wood. This machine is taken as a prototype.

 When sawing metals, stone and other difficult-to-process materials, the band saw is subject to large forces of resistance to cutting and its intense heating occurs. To achieve high rigidity and stability, the saw must be tensioned with great force and intensively cooled. Aerostatic curved guides can not provide a large lifting force with a high tension of the saw and heat dissipation.

 The problem to which the invention is directed is to increase the lifting force of the lubricating layer between the saw and curved guides and to ensure effective cooling of the saw.

 This is achieved by the fact that the working surfaces of the curved guides are made in the form of hydrostatic supports with a working fluid in the form of a cutting fluid.

 The design of the band saw is illustrated in the drawing.

 The band saw includes a band saw 1, worn on the upper movable 2 and lower stationary 3 curved guides, which is stretched using the tension mechanism 4. The working surfaces of the curved guides are made in the form of hydrostatic supports. Cutting fluid flows to the curved guides through hydraulic lines 5 and 6. The saw drive includes friction drive wheels 7 and 8, pressed against the side surfaces of the saw.

 Works band saw as follows. Band saw 1 is worn on the upper movable 2 and lower stationary 3 curved guides. Using the tension mechanism 4, the saw is tensioned to a predetermined voltage value. Through hydraulic lines 5 and 6, a cutting fluid is supplied under pressure, which, exiting onto the working surfaces of curved guides, forms hydrostatic supports. Using the friction wheels 7 and 8, a band saw is driven, material is supplied and sawed.

 The implementation of the working surfaces of the curved guides in the form of hydrostatic supports allows the movement of the band saw, stretched with great force, with minimal friction and to remove heat from the saw that occurs during the sawing of difficult to process materials.

Claims (1)

 A band saw for sawing difficult-to-work materials, containing upper and lower curved guides, a band saw is put on the working surfaces, and the drive of the latter, characterized in that the working surfaces of the curved guides are made in the form of hydrostatic supports.