SU1151442A1 - Compound for manufacturing abrasive tools - Google Patents

Abstract

MASS FOR MAKING AN ABRASIVE TOOL, containing abrasive and ceramic bond, including fireclay, aluminum, F1 fritted glass and temporary binder, characterized in that, in order to improve the performance of the tool by reducing its hardness, the ceramic bond additionally contains molybdenum disulfide in the following ratio of binder ingredients, wt%: Fireclay35.0-46.0 Aluminum 5.0-10.0 Molybdenum disulfide4, 0-14.0 Fritted glass F1 30.0-40.0 Temporary binder 5, 0-10 , 0 and abrasive and ceramic bond ( L is taken in a ratio, vol.%: Abrasive 12.5-37.5 Ceramic bond 62.5-87.5

Description

ate

one

The invention relates to the production of diamond, abrasive and diamond abrasive tools and can be used in factories producing abrasive tools, mainly for sharpening and finishing cutting tools for processing metals, alloys, and glass.

The known mass for the manufacture of an abrasive tool, consisting of an abrasive and a ceramic binder, comprising 38% fritted glass as a binder by mass, 46% refractory clay chamotte as a filler for imparting strength and obtaining the specified geometric shapes and dimensions of the tool , 8.5% aluminum for thermal conductivity, 7.5% boron carbide, which is incorporated into the binder to increase the hardness and wear resistance of the tool, and 6% of the temporary bonding polymer material. From this mass, the tool is molded when heated, removed from the mold, placed on a pallet and sintered in a furnace in an ambient atmosphere at 700-800 ° C in backfill of chamotte or without filling, depending on the shape and size of the tool ll.

The disadvantage of the known mass is that the introduction of boron carbide into the mass, especially in the case of application for polishing and superfinishing tools, significantly strengthens the product, increases its hardness. As a result, such a tool is very poorly earned (workability — the ability of the working surface of the tool to acquire the shape of the surface of the workpiece), quickly salted, does not provide the required removal of metal and the required roughness of the treated surface, which does not allow its use on automated equipment.

The purpose of the invention is to improve the performance characteristics of the tool workability, self-sharpening, processing quality to ensure the required performance by reducing its hardness.

The goal is achieved by the fact that in the mass for the manufacture of an abrasive tool containing an abrasive and a ceramic bond, including

chamotte, aluminum, F1 type fritted glass and temporary binder, molybdenum disulphide MoSj is additionally introduced into the ceramic bond in the following ratio of binder ingredients, wt%:

Shamot35,0-46,0

Aluminum5.0-10.0

Molybdenum disulfide 4.0-14.0 Fritted glass F130.0-40.0 Temporary binder (polymeric material) 5.0-10.0 and the abrasive and ceramic bond are taken in a ratio, vol.%:

Abrasive 12,5-37,5

Ceramite yeka

connection62,5-87,5

Fritted glass brand F1 has the following composition, wt.%:

SiOj 47,5-52,5 Silicon Sodium Oxide 6.7-7.35

3.8-4.2

Oxide of potassium Oxide of lithium 5.7-6.3

Barium oxide BaO6,7-7,35

Boric anhydride BjOj13,7-14,7

Aluminum oxide

AljOj9,5-10,5

The remaining oxides, 1.9-2.1. The proposed mass, consisting of the listed components of the binder and abrasive, is obtained by mixing dry powders in a mixer of any type, ensuring uniform distribution of particles in the bulk of the mass. From the mass consisting of abrasive and ceramic binder, the tool is molded in a mold by hot pressing under a pressure of 200–1000 kgf / cm at 100–300 ° C without holding or holding for 5–20 min. The resulting briquettes are removed from the mold, placed on a pallet, covered with soot or chamotte (or without a lock) and calcined in a furnace with a gradual rise in temperature to 700-800С in the ambient atmosphere. Products are cooled with the oven. MoO resulting from the oxidation of MoS in the first stage of heating the tool during firing, due to lack of oxygen, reacts again with MoSj, which leads to the formation of molybdenum dioxide MoOj. Thus, in the finished instrument, MoO and Moo ,, simultaneously are contained.

other components of the binder have poor adhesion, which results in a decrease in the hardness of the binder, which ensures better workability and self-sharpening of the tool.

Atomic sulfur liberating during the decomposition of MoSj actively reacts with alkali metal oxides, which are part of fritted glass, which melt at a temperature higher. The resulting sulfites of these metals also reduce the hardness of the binder. In addition, when the temperature begins, sublimation of MoO, which contributes to a certain weakening of the structure of the abrasive-containing layer of the instrument, giving it microporosity.

The original MoSj, introduced into the composition of the proposed mass, is a fine powder, the particle size of which is less than 7 microns. It mixes well with other components and evenly distributes in the volume of the product, which makes it possible to avoid defects in the structure of the tool during the firing process, to adjust the hardness of the abrasive-containing layer at the micro level, ensuring its stability. Diamond, elbor, hexanite, electrocorundum, chromium oxide, carbide can be used as an abrasive.

514424

titanium, silicon carbide and other abrasive materials, or mixtures thereof, for example, double (diamond and silicon carbide green) or triple (diamond, 5 elbor and electrocorundum). The temporary binder is a polymeric material.

The tool can be both with the case, and without it. Hull can

To consist, in particular, of the bond on the basis of which the abrasive-containing layer is made, but without an abrasive or with the addition of a less scarce abrasive. He may be from

f5 plastic or other material that provides the necessary strength and reliable fastening of the abrasive layer. From the proposed mass were made abrasive

20 bars.

The test bars were performed on a superfinishing machine model JI3-261 when processing the raceways of the inner rings of ball bearings

25 type 306/02 of steel ШХ15 (НКС62-64ед

Processing mode: the number of revolutions of products h 400 rpm; radial pressure P 1 MPa; the number of rolling tool tj. 1 too min; processing time Tysch 6 s; Coolant - oil on emulsion (oil I5A + 12% kerosene). Examples and results of tests of superfinishing bars of the proposed mass are given in the table in the comparison. Research institutes with well-known tools.

711514428

As can be seen from the table, the tool, 4 masl, results in an instrument containing 4–14 wt.% MoSj, in contrast with considerable hardness.

Which well-known tool from a well-known tool. Such a tool that is worse than a hpp is abrasive, fails, does not get wet; all gets very fast, and does not ensure the process of operation; it ensures that the required roughness of the treated surface, productivity, and stability is obtained. allowing you to remove the required allowance of metal for a limited cycle. Application of MoS in quantity

machine time when working on auto- more than 14% causes significant

matic and semi-automatic diminution of instrument hardness,

ore, which loses its wear resistance and

Application in the proposed Abra-may even be destroyed in the process

Ziva mass of MoS in an amount less. operation.

Claims (1)

WEIGHT FOR PRODUCING AN ABRASIVE TOOL, containing an abrasive and a ceramic binder, including chamotte, aluminum, frit glass F1 is a temporary binder, characterized in that, in order to improve the performance of the tool by reducing its hardness, the ceramic binder additionally contains molybdenum disulfide in the following ratio ingredient tov bundles, wt.%: Fireclay 35.0-46.0 Aluminum 5.0-10.0 Molybdenum disulfide dena 4.0-14.0 Fritted glass F1 30,0-40,0 Temporary connection Q that is 5.0-10.0 SS and the abrasive and ceramic bond are taken in the ratio, vol.%: Abrasive 12.5-37.5 Ceramic bond 62.5-87.5 SU ,,, 1151442