SU1283067A1 - Method of producing diamond tool - Google Patents

Abstract

The invention relates to the field of the tool industry and to various tools. In order to increase the durability and cutting ability of the tool, the prefixing value is chosen 0.3-0.5 grain size, while the tie for the prefixation is taken 1.5-2.0 times softer with & or carry out this operation in two stages, and the hardness of the bundle of the 1st stage is 2.5–3.0 times, and the second one is 1.15–2.0 times less than for the final fixing. 1 hp f-ly, 4 ill.

Description

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The invention relates to the instrumental industry and instrument making and relates to a method for producing a diamond tool with electroplating.

The aim of the invention is to increase the durability and cutting ability of the tool due to the increased concentration of large diamonds.

The described method of manufacturing a diamond tool on a galvanic bond consists of consistently depositing large diamonds, pre-fixing them with fine-tuning the tool in size or shape, depositing small diamonds and final overgrowing with a bonded metal, and the pre-fixing is produced by an H value of 0.3- 0.5A, where A is the size of the diamond grains. In this case, the bond for the preliminary consolidation of large diamonds or taken 1.15-2.0 times softer than the bond used for final fouling, or the preliminary fixing is carried out in two stages by successively applying the link in 2, 5-3.0 times, and then 1.15-2.0 times the softer bonding used for the final vanishing, the height of the bonding layer of the first pre-consolidation stage is 05-015A.

a fig 1 is the cross section of the diamondiferous surface with final growth by a bond containing small diamonds; in fig. 2 is a cross-section of the diamond-bearing surface with final binding overgrowth; in FIG. 3-section of the diamond-bearing surface with preliminary consolidation of large diamonds in two stages; in fig. 4 - scheme of finishing de size by section. gates of large diamonds.

A diamond tool consists of a body 1, large diamonds deposited on it 2 fixed previously by a layer 3 of metal. After the turn of the grains, 2 Oi are finally filled with either a layer of 4 metal (Fig. 2) or a layer of 5 metal with Mex diamonds 6 (Fig. 1 and 3). The pre-consolidation layer may consist of two parts 7 and 8 of different hardness.

The method is carried out as follows.

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Diamond grains are deposited on the surface of the instrument with known methods of galvanization in 2 large sizes and are pre-fixed by electroplating with metal bonding 3. Typically, the value of the preliminary silting is H 0.2A. In the described method, prefixing is carried out by the value of H (0.3-0,.;.. Such a prefixing value ensures reliable fixing of the single grains protruding beyond the envelope of the tool in the process of their turning during smoothing. If the layer size is for pre-consolidation, it is taken in the generally accepted limits (H 0.2A), then diamonds protruding beyond the tool size are removed, their concentration in the diamond-bearing layer is reduced, which determines their reduced durability and ezhu- -, conductive ability When using diamond turning is maintained in the resulting coating concentration 1li large diamonds..

After pre-fixing large diamonds, the tool is transferred to a lathe with dimensions that are suitable for the tool dimensions. The tool 9 is fixed in the chuck of the machine and attached to it, and in the toolholder set the rod tool ferent 10 in the form of smoothers and inform him of the movement along the tool. At the same time, the radial position of the tool is set to g: it is cast in order to obtain the required size. When the smoothing body touches the grain that protrudes beyond the size, as a result of the action of the tangential force, the latter turns in connection. As a result of the elastic after-effect, the grains may partially return to their original position. Therefore, in a number of cases, this operation is repeated several times, either by successively approaching the smoother to a given size, or by several passes with one smoother installed in the radial direction. Framed diamonds can be used as a burner.

Research has shown that the electrolyte, provided the hardness of nickel is HB 100-120, can be applied

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for instruments in which coarse grains do not exceed the size of 160/125. At large sizes of diamond grains, the elastic aftereffect increases so much that in order to turn the protruding grains beyond the dimension, it is necessary to apply only a multi-pass operation with the number of passes up to 6-10. Due to cracking, microcracks appear and the strength of grain fixing decreases significantly. This is due to the fragile nature of the destruction of nickel coatings derived from sulfuric acid electrolytes.

It has been established experimentally that, by pre-fixing diamonds with a grain size of 200 / 160-315 / 250 with a more ductile metal, it is possible to reduce the elastic aftereffect and turn the large diamonds to the required position in 1-2 passes. This requirement is met by nickel derived from sulfamic electrolyte and copper, whose hardness is 1.15-2.0 times less than the hardness of nickel obtained from sulfuric acid electrolyte. When using softer metals (zinc, cadmium), the strength of the fixation of single grains sharply decreases and diamond consumption increases during processing.

At the same time, when using larger diamonds (400/315 and larger), the use of sulfamic nickel and copper does not give positive results, since it is necessary to use multiple passes to turn the diamonds, which weakens the fixation of the grain.

As a result of the rotation of the grains in the prefixing layer, the greatest displacements have points located closer to the tool body. Moving these points determines a largely elastic after-effect. It was experimentally established that if coarse grains are preliminarily grown up by the amount of (0.05-.0.15) A with metal, their hardness is 2.5–3 times less than nickel sulphate, and then to the level (0.3–0 -, 5) And with sulfamic nickel or copper, then it is possible to turn diamonds with a grain size of 400 / / 315 in 1-2 passes and larger to the required position

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Thus, pre-consolidation for these diamonds should be carried out in two stages, with initially softer metals, such as zinc, cadmium.

After the operation, adjustment to the size is carried out either final diamond re-coating with electroplated nickel until it is completely fixed, or application of smaller diamonds 6 is applied. The latter option is used for dp tools used in processing materials with higher-. abrasive ability, such as chipboard, high porous, glass cristaphane materials, etc.

Depending on the required accuracy and the material being processed, the operation of depositing and fixing smaller diamonds can be performed several times, combined with fine-tuning to the size or shape to the desired saturation of the surface layer of the tool.

Example. The heads were made 0 18 + 0.05 with different completion of the diamond layer. The diamond layer consists of large diamonds and AFM 60/40 diamonds in the surface layer. Total zasroschennost large diamonds (0,) 7

The final overgrowing was carried out with nickel from electrolyte sulphate containing, g / l: NiSO jj: 7H O 5 300; Н1С1 „- 6Н„ 0 30; H, VO. | s6, dl

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nickel from sulfamic-electrolyte containing, g / l: Ni (), j. “4H, jO 350; NiCl ,, 6H20 40; 30, zinc from electrolyte sulphate containing, g / l: ZnSO-7H20 200; 50; AKSO) - IBHgO 30, dextrin, tin from electrolyte sulphate containing, g / l: SnSO 50; 5 80; 50, phenol 8, table glue 3, and copper from electrolyte sulphate containing, g / l: CuSO 250; -

CjHgOH 8.

Standard metal deposition regimes were used.

Large grains were turned on an OT-4 lathe at a frequency of 1 / min in 1-2 passes. The heads were mounted on an electric motor with a power of 25 kW, the frequency of rotation-: none of the heads rpm. Plates of glass-ceramic material of constant width were processed.

6 mm with mm, mm / min modes. The processing of the plates was carried out until complete failure of the head, i.e. , to wear diamond layer.

Features of the heads and the test results are shown in the table.

The data show that the proposed method of manufacture provides greater tool life compared to the known.

Claims (2)

Formula invented and t. A method of manufacturing a diamond tool on a galvanic bond by depositing large diamonds, pre-fixing them with fine-tuning the tool in size and shape, depositing small diamonds and finally overgrowing with metal  . . Removal of protruding grains Reversal of protruding grains Also 0,2A (about Nickel from sulfuric acid) acidic solution, 110 0.40A Oh, for- 0.25A 0.5A 0.60A 0.40A 0.40A k 0.40A 0.40A Also Nickel from sulfates of the new solution 90 Copper, 55 Zinc, 37 binder, characterized in that, in order to increase tool durability and cutting ability due to increased concentration large diamonds, pre-consolidation is carried out on the value of Н 0.3-0.5 A, where A is the grain size of the diamond, and the bond for the preliminary growing is taken 1.15 to 2.0 times softer than the binder used for the final overgrowth. 2. A method according to claim 1, characterized in that the pre-consolidation of large diamonds is carried out in two stages by successively applying the binder 2.5-3 times and then 1.15-2.0 times softer than the bond used for final growth, and The height h of the bonding layer of the first pre-consolidation stage is selected from the ratio h 0.05-0.15A. Nickel from sulfuric acid solution 110 Also Nickel from sulfamy-39.4 new solution 90 Copper, 55 Zinc, 37 .37.3 32.4 Reversal of the protagonist grains Also 0.4A 0.4A 400/315 . iO, 4A 400/315 0.4 Table continuation Nickel from sulfate solution 110 35.2 Zinc is, 35, thick, and nickel is from a sulmine solution, 9052.4 Tin thickness; 0.15A, 15, vr nickel from sulmicron solution, 9041.7 Zinc .0.05A; 35, and nickel from sulphamine solution, , 9050.3 522 , - .. 7 / fie. one fa g 2 7ce.