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Sintered carbide tool material for processing manganese steel, preparation and use thereof

A technology of cemented carbide and tool materials, which is applied in the field of cemented carbide tool materials for manganese steel processing and its preparation, which can solve the problems of large cutting force, wear of the front of the tool, and temperature rise, so as to increase the strength and improve the wettability Effect

Inactive Publication Date: 2009-05-20
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the slow heat transfer of manganese steel and severe work hardening, the cutting force is large during machining, the temperature rises, and the front of the tool wears extremely fast, especially in milling. Due to periodic thermal fatigue and mechanical shock, the service life of general tools is very short. short
According to the literature, there is no cemented carbide material brand specially for manganese steel rails and road forks at home and abroad, and the YT, YW alloys and imported TN35M (Germany Vidia) alloys currently used in China cannot reach the impressive level. Satisfactory effect

Method used

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  • Sintered carbide tool material for processing manganese steel, preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The rail shaping machine manufactured by GEISMAR company imported from France is equipped with TN35M blades from Vidia, a world-renowned cemented carbide company, and can repair and mill 15-20 standard rails with a length of 25m on average with a single edge.

[0020] The ratio is 20%-40%wt of titanium carbide, 20%-40%wt of tantalum carbide, and 20%-40%wt of tungsten carbide. Mix 150kg of tungsten carbide, tantalum carbide, titanium dioxide (titanium dioxide), and carbon black mixture in a dry ball mill for 5 hours, (the ratio of ball to material is 2:1); carbonize the material in a carbon tube furnace after being loaded into a boat. The carbonization temperature is 2250°C, hydrogen (H 2 ) protection, the speed of pushing the boat is 40min / boat, and then the WC-TiC-TaC ternary solid solution powder is obtained after cooling out of the furnace, crushing, ball milling and sieving.

[0021] According to the final composition ratio (weight) of the alloy: 6.5 to 20% TiC; 6....

Embodiment 2

[0027] A cemented carbide sawtooth for manganese steel processing, according to the final composition (weight) of the alloy: 6.5-20% TiC; 6.5-20% TaC; Ternary solid solution powder, cobalt powder, and tungsten carbide powder are prepared into an alloy according to the proportion of ternary solid solution powder 30%wt, cobalt powder 6%wt, and tungsten carbide powder 59%wt, adding medium acetone 5%wt, and inserting Mix and ball mill in a ball mill (wet type) for 72 hours, discharge, distill, dry and add paraffin wax molding agent. Forming with a mold on a press, and sintering (vacuum furnace, 1430°C, heat preservation for 50 minutes) to obtain a sawtooth blank, and its performance indicators are as follows:

[0028] Grade Density (g / cm 3 ) Hardness (HRA) Flexural Strength (MPa) Porosity

[0029] Five# alloy 12.0~13.0 89.0~92.0 1600~2500 A02B00C00

[0030] After welding and sharpening, the service life is equivalent to that of imported products.

Embodiment 3

[0032] A kind of processing manganese steel carbide milling cutter:

[0033] The ratio is 30%-35%wt of titanium carbide, 30-40%wt of tantalum carbide, and 25-45%wt of tungsten carbide. Thoroughly stir the mixture of tungsten carbide, tantalum carbide, titanium dioxide (titanium dioxide) and carbon black in a dry ball mill for 5 hours (the ratio of ball to material is 2:1); The temperature is 2250°C, under the protection of hydrogen, the speed of pushing the boat is 40 minutes / boat, it is cooled out of the furnace, crushed, ball milled, and sieved to obtain the WC-TiC-TaC solid solution.

[0034] According to the final composition ratio (weight) of the alloy: 8-25% TiC, 8-25% TaC, 9-13% Co, and the balance WC (1-5μ), the ternary solid solution powder, cobalt powder and tungsten carbide powder Prepare the alloy according to the ratio of ternary solid solution powder 20%wt, cobalt powder 13%wt, tungsten carbide powder 47%wt, add medium acetone 20%wt, put into ball mill (wet type...

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Abstract

The invention relates to a hard alloy tool material used for manganese steel processing, a preparation method and applications thereof. The hard alloy tool material contains 6.5 to 20 percent wt of titanium carbide, 6.5 to 20 percent wt of tantalum carbide, 8 to 13 percent wt of cobalt and the balance of 1 to 5 Mu of tungsten carbide. Compared with the existing tool material, the invention has higher thermal fatigue resistance and shock resistance, simultaneously has better front abrasion resistance as well as longer service life when processing manganese steel rails and can improve the durability by 50 to 100 percent compared with the alloy of YW and YT.

Description

technical field [0001] The invention relates to alloy materials, in particular to a cemented carbide tool material for manganese steel processing and its preparation method and application. Background technique [0002] The railway is known as the "artery" of the national economy and plays an increasingly important role in the economic development of the entire country. As the main components of the railway, rails and road forks are mostly made of manganese steel in order to improve their service life and life. Some manganese content is even as high as 13%. As we all know, one of the remarkable characteristics of manganese steel is serious work hardening phenomenon, which is a daunting difficulty for manufacturers because of its long service life and excellent quality. It is also the difficulty that has plagued tool engineers and technicians for a long time. Due to the slow heat transfer of manganese steel and severe work hardening, the cutting force is large during machin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C1/05B22F3/16
Inventor 刘莹华杜玉国林春芳王云岫
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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