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Manufacture method of super-hard grinding tool containing metallic or ceramic binder

A technology of vitrified bond and manufacturing method, which is applied in the direction of manufacturing tools, metal processing equipment, grinding devices, etc., can solve the problems of uneven carcass density, low labor productivity, poor stability of mold precision, etc., and achieve uniform carcass density Consistent, the realization of production automation, the effect of improving the internal quality

Active Publication Date: 2009-09-02
QINHUANGDAO DAOTIAN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One is the mold problem: (1) The cost of the mold is high and the processing is extremely difficult
Foreign manufacturers use expensive high-grade high-temperature alloys as materials to manufacture isothermal molds, the price is about 90,000-100,000 US dollars per ton, resulting in extremely high mold costs, and this material is extremely difficult to process; domestic manufacturers often use low-grade molds materials, the life of the mold can only reach several times or even once or twice, and a mold workshop must be specially equipped to manufacture molds without interruption, which doubles the cost of the mold; (2) the number of molds takes up a lot of capital
Isothermal forging requires a material to be equipped with a set of molds and follow the entire process flow. Therefore, as many workpieces as there are in each production batch, as many sets of molds must be configured, so that the number of molds is large, and when the production batch is large, the mold occupies funds. It can exceed fixed assets, resulting in huge capital occupation; (3) poor stability of mold precision, resulting in poor product quality stability: due to harsh working conditions, even if advanced materials are used, the stability of mold cavity dimensional accuracy cannot be guaranteed, and mold The dimensional accuracy of the cavity directly affects the density of the product, and the density of the product directly affects the intrinsic quality of the product
[0004] Second, the own characteristics of this process determine that it cannot adopt automatic production technology, and must rely on a large number of manual operations and single-piece production, so that the labor productivity is low, the product quality has many human factors, it is difficult to control, and the manufacturing cost is high.
[0005] Its three this process energy consumption is big, and energy waste is serious
Under normal circumstances, the weight of the mold in this process is 5-10 times the weight of the workpiece, and the mold and the workpiece need to be heated at the same time, so that 80-90% of the heat energy is consumed by the mold, resulting in serious energy waste
[0006] The fourth is one-way pressurization with a mold, so the density of the carcass is likely to be uneven in different directions

Method used

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  • Manufacture method of super-hard grinding tool containing metallic or ceramic binder
  • Manufacture method of super-hard grinding tool containing metallic or ceramic binder
  • Manufacture method of super-hard grinding tool containing metallic or ceramic binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Diamond is selected as the superabrasive, and the composition of the metal powder is (percentage by weight): 20% copper, 70% iron, 5% tin, 3% cobalt, and 2% graphite. Mix the above-mentioned working layer powder raw materials evenly. Assemble the mold and apply a release agent inside it, fill the mold with matrix powder and working layer powder raw materials in sequence according to the process, add the pressure head, move to the press to pressurize quickly, and the pressure is controlled at 350 MPa , hold the pressure for 2 minutes; remove the mold from the press, and get the green mold after demoulding; use the method of first combining and then heating and then pressing to combine the green mold with the pyrophyllite as the medium to form a green mold -Medium combination, so that pyrophyllite is evenly distributed around the green body, move the green body-medium combination into a heating furnace, heat it to 850°C and keep it warm for 3 hours; move the heated green ...

Embodiment 2

[0056] Cubic boron nitride is selected as the superhard abrasive material, and the composition of the metal powder is (percentage by weight): 50% bronze, 45% iron, 3% tungsten, and 2% graphite. Mix cubic boron nitride and metal powder of a certain particle size evenly in proportion to obtain the powder material of the working layer, assemble the mold and apply the release agent, and put the matrix powder and the powder material of the working layer in the bag in sequence. The sheath is sealed after vacuum to obtain a green body. The green body and pyrophyllite are combined to form a green body-medium combination, so that the pyrophyllite is evenly distributed around the green body, the green body-medium combination is moved into a heating furnace, heated to 860 ° C and kept for 3 hours, and the green body-medium combination Move the body into the pot-shaped mold, add the pressure head, pressurize quickly on the press, the pressure is 500 MPa, hold the pressure for 20 minutes, ...

Embodiment 3

[0058] Diamond is selected as the superabrasive, and the composition of the metal powder is (percentage by weight): 18% tungsten carbide, 5% nickel, 4% manganese, 3% cobalt, and 70% copper. The medium is made of amorphous non-metallic material, and its composition is (percentage by weight): 5% B 2 o 3 , 15% sodium oxide and 80% silicon oxide, cold pressing pressure is 500 MPa, holding pressure for 1 hour, hot pressing pressure is 200 MPa, holding pressure for 25 minutes, heating temperature is 800 ° C, holding time is 2 hours , all the other are identical with embodiment 1.

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Abstract

The invention relates to a manufacture method of super-hard grinding tool containing metallic or ceramic binder, comprising following steps: material preparation, preparation of grinding tool green bodies, formation of the combination of the grinding tool green bodies and medium and its heating and pressing, machining of grinding tool green bodies, namely: firstly preparing for the working layer powder material, then chill-pressing to produce the green bodies or loosing to producing the green bodies, combining into a combination of green body-medium, rapidly heating and pressing the combination, at last further processing the grinding tool green bodies. The manufacture method can ensure an uniform pressure to the blank from the all directions and saves the dies and saves the money and energy source.

Description

technical field [0001] The invention relates to the field of tool manufacturing, in particular to a method for manufacturing a superhard grinding tool using metal or ceramic as a bond. Background technique [0002] At present, the isothermal forging method is mostly used in the manufacture of superhard abrasive tools. The principle is that after the raw material powder is loaded into the isothermal mold, the mold and the powder are sent to the heating furnace for heating and heat preservation, and finally forged. It is called isothermal forging because it is the same temperature as the workpiece, and its basic process includes: mold loading - preloading - heating - forging - cooling - mold unloading - further processing. The isothermal forging process has been developed for decades in the world, but there are still several major problems plaguing many abrasive tool manufacturers: [0003] One is the mold problem: (1) The cost of the mold is high and the processing is extrem...

Claims

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Application Information

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IPC IPC(8): B24D18/00B22F3/00
Inventor 高峻峰
Owner QINHUANGDAO DAOTIAN HIGH TECH
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