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Self-lubricating hot-forging die based on Sialon ceramic and manufacturing method thereof

A hot forging die, self-lubricating technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of lubricating oil pollution, friction and wear of hot forging die, etc., and achieve the effect of avoiding environmental pollution problems.

Active Publication Date: 2018-09-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a self-lubricating hot forging die based on Sialon ceramics and its preparation method, aiming to solve the problems of friction, wear and lubricating oil pollution in hot forging dies under high temperature environment

Method used

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  • Self-lubricating hot-forging die based on Sialon ceramic and manufacturing method thereof
  • Self-lubricating hot-forging die based on Sialon ceramic and manufacturing method thereof
  • Self-lubricating hot-forging die based on Sialon ceramic and manufacturing method thereof

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preparation example Construction

[0039] refer to Figure 4 , a kind of preparation method of self-lubricating hot forging die based on Sialon ceramics, comprises the following steps:

[0040] Step S10, weighing an appropriate amount of NiCr metal powder, Sialon ceramic powder, CaF 2 After powder and stearic acid granules, put the weighed powder into a metal tank, add stainless steel balls, vacuumize and fill with nitrogen for protection, and use a ball mill to mix the powder by ball milling;

[0041] Step S20, the mixed powder is pressed and formed by a mold, and placed in a vacuum tube sintering furnace for sintering to form;

[0042] In step S30, after the sintered sample is polished, it is prepared into an insert and applied in a hot forging mold.

[0043] In step S10, the ball mill mixes the powder for 4-6 hours. If the ball milling time is too short, the material will be mixed unevenly, if the time is too long, cold welding will occur between the powders, and the powder particles will become thicker. ...

Embodiment example 1

[0051] A NiCr-Sialon-CaF 2 Self-lubricating mold material, prepared by the following method.

[0052] 1. Configure NiCr-Sialon-CaF 2 Powder: Take 80 parts of Ni80Cr20 powder, 10 parts of Sialon powder, CaF 2 10 parts of powder, 1.5 parts of stearic acid as a forming agent; put it in a metal tank, vacuumize and fill it with nitrogen, and mix it by ball milling for 5 hours, the ratio of ball to material is 1:6, and the speed is 200r / min;

[0053] 2. The powder mixed with the ball mill is sieved, the pore size of the screen is 200 mesh, the prepared powder is taken and pressed in the mold, the pressure is 22Mpa, and the holding time is 1min;

[0054] 3. The pressed and formed pattern is placed in a crucible, heated to 1200 degrees Celsius in a vacuum tube furnace, and kept for two hours;

[0055] 4. The heating program of the vacuum tube furnace: After 1 hour, heat to 400°C; keep at 400°C for 30 minutes; then heat to 1200°C after two hours, keep at 1200°C for 2 hours; Cool to...

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Abstract

The invention discloses a self-lubricating hot-forging die based on Sialon ceramic. The self-lubricating hot-forging die based on the Sialon ceramic comprises an outer die body and an inner die body embedded in the outer die body, wherein the inner die body comprises a nickel-chromium matrix phase, a ceramic hard phase and a self-lubricating phase, NiCr alloy powder serves as the nickel-chromium matrix phase, Sialon ceramic powder serves as the ceramic hard phase, and CaF2 powder serves as the self-lubricating phase. The three-phase powder of the nickel-chromium matrix phase, the ceramic hardphase and the self-lubricating phase are mixed evenly through a ball grinding mill, and then the inner die body is manufactured through a powder metallurgy method. By the adoption of the self-lubricating hot-forging die based on the Sialon ceramic, the problems of friction abrasion and lubricating oil pollution occurring to the hot-forging die under a high temperature environment are solved.

Description

technical field [0001] The invention relates to the field of high-temperature self-lubricating materials, and in particular designs a self-lubricating hot forging die based on Sialon ceramics and a preparation method thereof. Background technique [0002] During the forging and extrusion production process of the mold, the phenomenon of mold wear often occurs, especially in the high temperature environment, the wear phenomenon is more significant. Due to the existence of friction and wear, the service life of the mold is reduced. However, the cost of industrial molds is high, and the molds are required to have a long service life in high-temperature environments. How to effectively overcome the friction and wear of molds in high-temperature environments is very necessary. [0003] In industrial production processes, organic lubricating greases or lubricants are often used. However, the commonly used organic lubricating grease will oxidize and decompose under high temperatu...

Claims

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Application Information

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IPC IPC(8): B21J5/02B22F5/00B22F1/00
CPCB21J5/02B22F5/00B22F2998/10B22F2999/00B22F1/105B22F2009/043B22F3/02B22F3/1007B22F2201/02B22F2201/20
Inventor 王华君杨浩常明姚振华周春阳李梦璐陈稳
Owner WUHAN UNIV OF TECH
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