SU1123789A1 - Method of manufacturing cutting tools - Google Patents

Abstract

THE METHOD OF MANUFACTURING A REAGENT TOOLS by author. St. No. 941012, characterized in that, in order to increase the durability of the obtained tools, after joining the working part and the shank, heat treatment is hardened, and before extruding the material of the shank into the chip grooves of the working part, these grooves are filled with glass enamel, the melting temperature of which temperature range of hardening heat treatment.

Description

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The invention relates to the processing of metals by pressure and can be used in tool manufacturing in the manufacture of end cutting tools.

According to the main author. St. . No. 941012 discloses a method for manufacturing cutting tools, which includes the manufacture of a tool working part with a chip groove, a shank and a connection of the working part and a shank by radially squeezing the shank metal of the side surface of the tool's working part, and squeezing the material of the shank into the chip grooves of the working part before the radial crimping tool 1.

A disadvantage of the known method is the low durability of the obtained tools with helical flutes when processing this tool with high-strength materials. Due to the difference in the linear expansion coefficients of the working part and tool shank metals, during heating and cooling during annealing and quenching in the joint zone, tension is weakened between the shank and the screw profile of the work piece, the latter is unscrewed from the shank, warped and broken.

The purpose of the invention is to increase the durability of the resulting tools.

This goal is achieved in that according to the method, after joining the working part and the shank, a strengthening heat treatment is carried out, and before extruding the material of the shank into the chip grooves of the working part, these grooves are filled with a glass enamel slip, the melting temperature of which corresponds to the temperature range of the strengthening heat treatment.

FIG. 1 shows a part of the tool cutter, the chip grooves of which are filled with glass enamel; in fig. 2-shank cutters; in fig. 3 — milling cutter obtained as a result of the process of connecting the working part with the shank; in fig. 4 is a process diagram (4a is the position of the parts to be joined at the extrusion stage, 46 is the same at the radial reduction stage).

The manufacture of the tool in accordance with the proposed method is carried out in the following sequence.

By means of machining or extrusion, the working part 1 of the tool is made of high-speed steel, hardened and filled with chip grooves with glass clipper, layer 2 of which is applied to the joint area of the working part with the shank (Fig. 1). Make the shank 3 with the docking part

4, the metal of which is intended to compress the working part 1 (Fig. 2c).

The working part with glass-enamel slurry applied is installed in the die matrix 5 5, centering it from the bottom end in the ejector 6, and along the lateral surface in the die section 7 (Fig. 4a).

Then, in the inductor, the connecting part 4 of the shank 3 Q is heated in the inductor up to 1100-150 ° C and the x-orient is installed in the matrix 5, its centering relative to the matrix by means of the connecting part 4 (Fig. 5a).

In one stroke of the press, I punch 8 on the upper end of the shank 3, press the metal of the docking part 4 5 of the shank 3 into the working part 1 of the tool.

At the same time, in the first stage of crimping, the metal of the shank 3 is squeezed out into the chip grooves (Fig. 5a), and in the second, the squeeze of the extruded metal at the site 9 made in the matrix (Fig. 46).

The punch 8 is retracted to the upper position (not shown in Fig. 4), the finished cutter is removed by the ejector 6 (Fig. 3, from the die, and the operating cycle repeats. 5

The manufacturing method of cutting tools was tested under production conditions in the manufacture of end mills with a diameter of 012 with a working part made of steel grade P 18 with a shank made of steel grade 45. 0 The chip grooves were filled with glass enamel, which contains weight. %:

Glass enamel EVTYU with

temperature of melting

950-125b ° C60-65

Clay3.5-4.0

Polyethyleneoxide 1,0-2,0

Ethoxylated

alkylphenol2.0-3.0

WaterEverything

The compression of the working part of the cutter with the metal of the shank was carried out after the slit of the applied layer of the glass enamel slip.

At the extrusion stage, the upper glass enamel layer softened at the punching temperature and served as a process lubricant. Polyethylene oxide and ethoxylated alkylphenol evaporated, forming an additional, gaseous, separating lubricant layer, which improves extrusion conditions. At the stage of precipitation of the extruded metal, a significant part of the glass was locked in the chip grooves in the form of dowels or wedges that prevent the cutting part from unscrewing from the shank.

During the hardening heat treatment of the cutting tool, glass enamel, opal, flows down the groove into the zone of connection of the shank with the cutting and, solidified upon cooling in the medium, wedges the connection of the shank-cutting part.

Claims (1)

METHOD FOR MANUFACTURE OF CUTTING TOOLS by ed. St. No. 941012, characterized in that, in order to increase the durability of the resulting tools, hardening heat treatment is carried out after connecting the working part and the shank, and before extruding the material of the shank into the chip grooves of the working part, these grooves are filled with glass enamel slip, the melting temperature of which corresponds to the temperature range of the hardening heat treatment.