SU990418A1 - Method of producing diamond tool - Google Patents

Description

(54) METHOD OF MANUFACTURING DIAMOND TOOLS

The invention relates to powder metallurgy, in particular, to the manufacture of alumina abrasive tools, and can be used, for example, in the manufacture of drill bits.

A known method of making diamond tools from a diamond mass containing diamond grains and filler, fastened with a metal binder, and 3-15 vol. % graphite powder, pre-metallized Fe, Co, Ni. In the manufacture of diamond tools, diamond powder is mixed with a binder powder and a filler. The filler of this diamond mass includes graphite powder, pre-metallized Fe, Co, Ni. The resulting mass is molded and sintered I.

The disadvantage of this method is the low wear resistance of the tool.

The closest to the invention to the technical essence and the achieved result is a method of manufacturing a diamond tool, which includes the formation of the working layer of the tool by layer-by-layer deposition of glue, filler powders and metallic bonding on the grains of diamond and the subsequent joint

sintering the working layer with the tool body.

The manufacturing process of an A..1. Diamond tool is carried out as follows.

Surface. Diamond I11x grains are moistened with an adhesive and mixed thoroughly. POHOHJOK filler, for example, nickel, is gradually added to the diamond grains moistened with an adhesive. With continued agitation (rolling), the diamond core disintegrates into individual diamond grains, coated with, to a metallic powder. The upper outermost | layer is formed by a poron of a metal bond, for example iron, copper, in the 15th manner. The resulting granules are then snapped off and simultaneously fixed to the housing 2.

The disadvantage of the known method is the low wear resistance of tools due to the fact that each alma; u-pii) is found in a hard metal frame that does not provide cushioning during p.ibot of diamond grains and shredding and its premature production. . The aim of the invention is to increase the wear resistance of diamond tools. To achieve the goal, according to the method of manufacturing a diamond tool, which includes forming the working layer by layer-by-layer deposition of glue, filler and metal ligaments on the grains of diamond and subsequent joint sintering of the working layer with the tool body, before applying the filler powders and metal ligature on the diamond grains Apply a layer of graphite powder in an amount of 3-8% by weight of diamond grains. The manufacture of the tool is carried out as follows. A portion of the diamond powder is moistened with an adhesive. 25% of the calculated weight of graphite powder is added to the diamonds moistened with adhesive. The resulting mass is carefully moved and get diamond grains coated with a layer of graphite powder. The primary granules are placed in the granulator and the rest of the graphite powder is weighed in, the granules are wetted with a suspension (a mixture of alcohol and glycerin, 5% solution of rubber in gasoline or any other wetting agent). The obtained graphite granules are applied in a napply layer. Various refractory materials can be used as a filler, for example tungsten carbides, titanium carbides. In applying a layer of fillers, the graphite granules are also wetted with a suspension. The granules are coated with a layer of metal binder (as a bond different compositions based on copper, tin, iron, nickel, and other materials can be used 6bfTb. Granulation is carried out until the granules have the required calculated weight. The pre-dried graphite granules are poured into a graphite mold. A mixture of filler material and binder is used as the welding layer. The body is installed. The matrix material is sintered and simultaneously fixed to the body. The tool is transferred for machining. Example Take 1 g (5 carat of diamond powder ACC grade, grit 250/200. A portion of the diamond powder is moistened with an adhesive of epoxy resin ED20 in the amount of 0.01 g, which is 1/100 of the weight of the diamond powder. A 25 / на portion of graphite powder is added to diamonds moistened with an adhesive substance — 0.02 g. The amount of graphite powder is based on the weight of the granulated diamond grains, i.e., 0.08 g. The resulting mass is thoroughly mixed. The primary graphite granules are placed in the granulator and the remaining portion of the graphite powder is rolled. At the same time, the granules are periodically wetted with a 5 ° / ohm solution of rubber in gasoline. A filler layer is applied to the obtained graphite granules moistened with a solution of oleic acid and petroleum jelly (1: 2). Tungsten carbide is used as a filler. The resulting granules are coated with a layer of metallic binder. When metal bonding is applied to the granules, a wetting agent (5 ° / rubber solution in gasoline is added). The granules are dried and poured into a graphite mold. A mixture of filler and metal binder in the ratio of 50:50 vol. % - 11 g VKB and 7 g of copper powder. Install the case. The sintering of the matrix is carried out with simultaneous fixing on the case at t 950 °, sintering time T 15 min and pressure P 200 kg / cm. According to the described technology, a batch of experimental crowns was manufactured and tested. Experimental studies of the manufactured tool were performed under laboratory conditions on a special stand, created on the basis of the 2A55 radial drilling machine. in the course of experimental studies in the laboratory, axial load was recorded while drilling (with a pressure gauge); power consumption (wattmeter); Driving (limb mounted on the drilling head of the machine with an accuracy of 1 mm); drilling time (stopwatch). The crown was worked out until complete wear of the working layer. The data of working out the tool are given in table. 1 and 2. As can be seen from the table. 1, the use of graphite powder increases tool wear resistance (wear resistance is determined by the amount of penetration to the crown). A layer of graphite powder fills the irregularities on the surface of each diamond grain. When drilling hard and very hard rocks, when considerable frictional forces arise and intense heat generation occurs, a layer of graphite powder impregnated with a binder, sludge wetting material for diamond grains and as a soft cushioning of the shell prevents the grains from chipping and crushing on impact. Reducing the graphite content below 3% makes it impossible to create a protective sheath around the diamond grains and does not protect the grains from thermal effects and shock loads. Increasing the graphite content above 8% does not allow uniform and rapid wear of diamond grains, the material becomes low-wear-resistant and wears out much faster than diamond grains. At the same time, diamond grains fall prematurely, without having fully completed their resource. The application of the proposed method of manufacturing a tool allows you to increase

250/200

Table 1

table 2

15.7

CuMn 11.1 16.0 lit, 8 11, 0 10.9 penetration on the crown while drilling granite X of category 35- / O, which will make it possible to reduce the cost per meter of drilling by 0.84 rubles / m - 1.46 rub / m At the same time, the cost of 1 crown of the TC reduction is 7.5-17.2 rubles / crown.

„990418

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Claims (2)

The claims of the invention before applying the filler powders and the method of manufacturing diamond tools instrumented deposition of a layer of graphite powder, ment, including the formation of a working amount of 3-8% of the weight of diamond grains, layer by layer-by-layer deposition of adhesives, powders of diamond s taken into account in the examination of the filler and metal binder, and after -1. USSR author's certificate of blowing joint sintering of working layer No. 228557, cl. 24 D 3/06, 1966. with a tool body, characterized in that 2. USSR author's certificate that, in order to increase wear resistance, No. 132970, cl. In 24-D 3/06, 1960. metal bonded diamond grains before