(57) Abstract:The invention relates to the treatment of materials by cutting, in particular for diamond tool manufacturing amplitude diffraction gratings and similar products. The cutter has a front surface, two side planar face and a rear surface, part of which is from the top of the cutter is made flat. To improve the quality of the production amplitude diffraction gratings by improving the cutting properties of the front surface is made concave cylindrical and flat part of the back surface paired with a cylindrical part made on the rear surface. Thus the value of the angle formed by the plane tangent to the front cylindrical surface at the apex of the cutter, and the flat part of the back surface is selected in the range of 60-85°. 2 Il. The invention relates to the treatment of materials by cutting, in particular for diamond tool manufacturing amplitude diffraction gratings and similar products.The diffraction amplitude grating is a regular structure of transparent and opaque strip elements formed in a thin (0.0002 mm - 0,008 mm) metal layer deposited on cachestate amplitude gratings". Priority from 29.11.82 year). The cutter includes two lateral cylindrical surface and an additional planar face positioned at an angle 1-2oto the plane perpendicular to the longitudinal axis of the tool holder of the tool.The lack of cutter is that the material layer when forming them grooves of the grating is not cut and plastically deformed and shifted in the adjacent cutter plots layer, this leads to the formation of piles and increased tension in these areas and, as a consequence, sometimes to the separation layer from the substrate.The closest in technical essence to the proposed diamond cutter is diamond cutter (see the compilation of Diamond tools in engineering. Lenizdat, 1965, page 86, Fig. 8). The cutter has a flat side, the front and rear faces. The rear face is at an angle 35oto the plane perpendicular to the axis of the tool holder of the tool.The lack of cutter is that when forming the grooves of the grating cutter with a sharp peak (55o) touches the glass substrate, i.e., the contact area is very small, specific same high pressure, resulting on the surface of the workpiece, i.e., on a transparent elements scratches are formed. In addition, the reduced optical performance of the grating.The objective of the invention is improving the quality of the production amplitude diffraction gratings, due to the improved cutting properties of the diamond cutter.This object is achieved in that in the diamond cutter, containing the front surface, two side planar face and a rear surface, part of which is from the top of the cutter is made flat, the front surface is made concave cylindrical, and the rear flat portion of the rear surface paired with a cylindrical part made on the rear surface, and the angle formed by the plane tangent to the front cylindrical surface at the apex of the cutter, and the flat part of the back surface that is selected in the range from 60 to 85o.In Fig. 1 there is shown a cutter, front view,
in Fig. 2 - the same, lateral view.Diamond cutter includes: a holder 1, enshrined in her diamond 2, the front concave cylindrical surface 3, two lateral flat faces 4 and 5, and enclosed between the rear surface, one piece 6 which, from the top 7 of the cutter, made flat, owing turning 8 in the cylindrical part of the back surface. Concave front cylindrical surface 3, in the top 7 pick, but the part 6 of the rear surface. This angle is selected within 60 - 85o.The cutter works as follows.The cutter is mounted relative to the workpiece (substrate with a metal layer) in Fig. not shown, so that it touches its cylindrical portion 8 of the rear surface. Then reduce the installation angle between the flat part 6 of the rear surface to zero, then the cutter is moved in the direction indicated by the arrow A. When the material layer of the workpiece is to be cut at its full thickness, leaving behind the transparent elements of the lattice of the desired width, and there are no piles on the edges of the strokes.The angle of the cutter within 60-85oselected from conditions improve cutting and strength properties. The choice of angle < 60oreduces the mechanical properties of the top 7 of the cutter, resulting in an increase in the probability of splitting it, and when the angle of > 85oincreases the force on the branch cut of the layer from the substrate, it causes deformation of the layer before the cutter and increases the stress in the layer, which extends adjacent to the cutter plots layer that lead to the separation from the substrate in these areas.So abovespecified running grooves of the grating full profile with transparent sections of the desired width. Diamond cutter having a front surface, two side planar face and a rear surface, part of which is from the top of the cutter is made flat, characterized in that the front surface is made concave cylindrical and flat part of the back surface paired with a cylindrical part made on the rear surface, and the angle formed by the plane tangent to the front cylindrical surface at the apex of the cutter, and the flat part of the back surface that is selected in the range of 60 - 85o.
FIELD: technological processes.
SUBSTANCE: invention claims diamond tool manufactured with monocrystallic diamond, synthesised under high pressure by temperature gradient method, so that the claimed diamond crystal contains not more than 3 parts per million of nitrogen. The tool features a blade with its edge oriented in plane (110), so that Knoop scale hardness at the plane (100) in direction <110> is higher than in direction <100>. Such synthetic monocrystallic diamond is synthesised by temperature gradient method under superhigh pressure and high temperature, and its crystals contain nickel atoms introduced by atomic substitution or boron and nickel atoms introduced by atomic substitution.
EFFECT: obtaining cheap synthetic monocrystallic diamonds with reduced flaw number.
24 cl, 4 ex, 2 tbl, 7 dwg
SUBSTANCE: it is prepared mixture of abrasive dust of coarse grain and, at least, of one fine grain, mixture of powders is compacted and impregnated by metals or alloys. In the capacity of powders, at least, of one fine grain there are used powders, surface of which fulfil wettability conditions by impregnating metals or alloys.
EFFECT: method provides increasing of working layer height of elements, and also receiving in the element defined content of abrasive grains for optimal external environment.
12 cl, 1 dwg, 5 ex
SUBSTANCE: there are used powders of super-hard materials of at least two granularities. Also, porous base of the element is made of powders of super-hard materials of higher granularity. Porous base is placed in a bath with suspension containing powders of small granularity and these powders are settled in pores of porous base with electric current transmitted through suspension, where upon all grains of super-hard material are bound with binding.
EFFECT: utilisation of powders of super-hard materials of small granularity including nano dimensions for fabrication of cutting elements with uniform distribution of grains in volume; reduced time of process.
SUBSTANCE: invention relates to production of heat-resistant polycrystalline diamond composites for production of cutting elements. On the boundary of division on the substrate of ceramic material, metal or cermet applied is heat-resistant diamond plate, which contains a layer of first impregnating material, selected from VIII group of periodic system of chemical elements or eutectic composition of said elements and placed between lower surface of said heat-resistant diamond plate and upper surface of said substrate. Material of coating from boron nitride, graphite or aluminium oxide is applied on the surface of said diamond plate, except the surface on the boundary of division. After that, applied on each other heat-resistant diamond plate and substrate are subjected to thermal cycle, consisting of heating, temperature support and cooling, ensuring transition of, at least, part of said impregnating material into liquid state for migration into heat-resistant diamond plate and into said substrate in the area of the boundary of division for their connection to each other. Said first impregnating material is used in amount, ensuring, at least, 90% of its transition into material of said substrate and plate.
EFFECT: production of working elements of metal-processing instrument, external part of which possesses high hardness, with internal one possessing high shock viscosity, is ensured.
41 cl, 10 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to PCD diamond to be used in production of water-jet ejectors, engraving cutters for intaglio, scribers, diamond cutters and scribing rollers. PCD diamond is produced by conversion and sintering of carbon material of graphite-like laminar structure at superhigh pressure of up to 12-25 GPa and 1800-2600°C without addition of sintering additive of catalyst. Note here that sintered diamond grains that make this PCD diamond feature size over 50 nm and less than 2500 nm and purity of 99% or higher. Diamond features grain diameter D90 making (grain mean size plus grain mean size × 0.9) or less and hardness of 100 GPa or higher.
EFFECT: diamond features laminar or fine-layer structure, ruled out uneven wear, decreased abrasion.
15 cl, 5 tbl, 5 ex
FIELD: process engineering.
SUBSTANCE: invention relates to production of cutters from cemented carbide with superhard tips for destruction of hard and abrasive materials. Cutter (100) comprises insert (110) including superhard tip (112) jointed with support body (114) from cemented carbide with stem (118) and steel holder (120) for said insert (110). Steel holder (120) comprises shaft (122) for connection with tool arbour (not shown) and channel (126) to accommodate stem (118). Said stem fits in said channel through at least 4 cm. Volume of support body (114) from cemented carbide makes at least 10 cm3. Stem surface area adjoins the channel surface inner area making at least 20 cm3 while stem diameter making at least 1.5 cm and not over 4.0 cm. Cutter stem is fitted in steel holder channel with interference fit of 0.002-0.3%.
EFFECT: higher tool hardness, longer life.
13 cl, 11 dwg, 1 tbl
SUBSTANCE: invention relates to polycrystalline diamond for use in a variety of instruments. Polycrystalline diamond is characterized in that it comprises a sintered diamond grains having an average grain diameter of more than 50 nm and less than 2500 nm, the purity of 99 % or more and the grain diameter of D90, is (average grain diameter + average grain diameter of × 0.9) or less, wherein the polycrystalline diamond has a lamellar structure and has a hardness of 100 GPa or more.
EFFECT: water jet nozzle cutter for engraving gravure scriber, cutting tool and scribing clip from such material ensures stable processing over a long period of time as compared with conventional tools comprising monocrystalline diamond and the sintered diamond compact containing metal binders.
13 cl, 5 tbl, 62 ex