Handling method for improving corrosion resistance of stainless steel mold

A technology of corrosion resistance and treatment method, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of low chemical reagent tolerance, reduced production efficiency, and reduced precision, so as to reduce the difficulty of polishing and improve processing. Efficiency, the effect of reducing the grain size of metal crystals

Inactive Publication Date: 2018-04-03
蚌埠中梁机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production of the mold industry, various molds and tools used to obtain the required products by injection molding, blow molding, extrusion, die-casting or forging, smelting, stamping, etc. Moreover, the precision required is high, so the mold needs to have high corrosion resistance to ensure the size and performance of the molded article; the stainless steel mold currently used is a common metal mold, which is not easy to rust in dry air, but The tolerance to chemical reagents is low, it is easy to rust, the precision is reduced, and it needs to be cleaned frequently, the process is cumbersome, and the production efficiency is obviously reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A treatment method for improving the corrosion resistance of stainless steel moulds, comprising the following steps:

[0019] (1) Cleaning: Place the cast stainless steel mold in a cleaning agent solution, and ultrasonicate at 31kHz for 20 minutes to obtain a cleaned piece;

[0020] (2) Polishing: Freeze the cleaned piece for 20 hours at -33°C, place it in an ultrasonic polishing machine, the polishing suspension is a silica suspension, polish at 8°C, 28kHz for 40 minutes, and wash to obtain a polished piece ;

[0021] (3) Quenching: Heat the polished piece at 3.2°C / min to 400°C, keep it warm for 70 minutes, place it in a diammonium phosphate solution with a mass concentration of 1.3% for quenching, and naturally cool down to room temperature to obtain a quenched piece;

[0022] (4) Nitrogen immersion: place the quenched piece in a heating furnace, pass through ammonia gas, the volume fraction in the heating furnace is 2.4%, heat up at 1.6°C / min, heat to a temperature ...

Embodiment 2

[0026] A treatment method for improving the corrosion resistance of stainless steel moulds, comprising the following steps:

[0027] (1) Cleaning: Place the cast stainless steel mold in a cleaning agent solution, and ultrasonicate at 32kHz for 23 minutes to obtain a cleaned piece;

[0028] (2) Polishing: Freeze the cleaned piece for 22 hours at -32°C, place it in an ultrasonic polishing machine, the polishing suspension is a silica suspension, polish at 9°C, 29kHz for 43 minutes, and wash to obtain a polished piece ;

[0029] (3) Quenching: heat the polished piece at 3.3°C / min to 430°C, keep it warm for 75 minutes, place it in a diammonium phosphate solution with a mass concentration of 1.4% for quenching, and naturally cool down to room temperature to obtain a quenched piece;

[0030] (4) Nitrogen immersion: place the quenched piece in a heating furnace, pass through ammonia gas, the volume fraction in the heating furnace is 2.5%, heat up at 1.7°C / min, heat to a temperature ...

Embodiment 3

[0034] A treatment method for improving the corrosion resistance of stainless steel moulds, comprising the following steps:

[0035] (1) Cleaning: Place the cast stainless steel mold in a cleaning agent solution, and ultrasonicate at 33kHz for 25 minutes to obtain a cleaned piece;

[0036] (2) Polishing: Freeze the cleaned piece for 24 hours at -31°C, place it in an ultrasonic polishing machine, the polishing suspension is a silica suspension, polish at 10°C, 30kHz for 45 minutes, and wash to obtain a polished piece ;

[0037] (3) Quenching: Heat the polished piece at 3.4°C / min to 450°C, keep it warm for 80 minutes, place it in a diammonium phosphate solution with a mass concentration of 1.3~1.5% for quenching, and naturally cool down to room temperature to obtain a quenched piece;

[0038] (4) Nitrogen immersion: place the quenched piece in the heating furnace, pass through the ammonia gas, the volume fraction in the heating furnace is 2.6%, raise the temperature at 1.8°C / mi...

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PUM

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Abstract

The invention mainly relates to the technical field of mold machining, and discloses a handling method for improving corrosion resistance of a stainless steel mold. The method includes cleaning, polishing, quenching, nitrogen leaching and packaging. The method is simple and operation is convenient. The cast stainless steel mold is subjected to ultrasonic cleaning, impurities are removed, the stainless steel mold can further be homogenized, and the corrosion resistance of the mold is improved. Low-temperature freezing is conducted at first and then low-temperature polishing is conducted after cleaning. The metallic luster of the stainless steel mold can be maintained, polishing difficulties are lowered, the roughness is lowered to 0.09 microns, and machining efficiency is improved. The temperature is raised quickly after polishing, and then the stainless steel mold is put into a diammonium phosphate solution for quenching. A protective film is formed on the mold surface, and the corrosion resistance of the mold is improved.

Description

technical field [0001] The invention mainly relates to the technical field of mold processing, in particular to a treatment method for improving the corrosion resistance of stainless steel molds. Background technique [0002] In the production of the mold industry, various molds and tools used to obtain the required products by injection molding, blow molding, extrusion, die-casting or forging forming, smelting, stamping, etc. are tools used to shape articles; molds are used more frequently. Moreover, the precision required is high, so the mold needs to have high corrosion resistance to ensure the size and performance of the molded article; the stainless steel mold currently used is a common metal mold, which is not easy to rust in dry air, but The tolerance to chemical reagents is low, it is easy to rust, and the precision is reduced. It needs to be cleaned frequently, and the process is cumbersome, which obviously reduces the production efficiency. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C21D1/18C21D1/60C21D9/00C23F17/00
CPCC23C8/26C21D1/18C21D1/60C21D9/0068C23F17/00
Inventor 何士忠
Owner 蚌埠中梁机械科技有限公司
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