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Surface strengthening process of metal mold

A metal mold and surface strengthening technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of poor service performance of metal molds

Inactive Publication Date: 2018-10-12
苏州国立塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in wear resistance, oxidation resistance, high temperature stability, and hardness performance. The poor service performance of metal molds has become a bottleneck problem restricting the rapid development of my country's equipment manufacturing industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] S1: Sand blow the metal mold, then put it into an ultrasonic cleaner containing 5% water-based cleaning agent for cleaning for 10 minutes, and then clean it with distilled water and dry it in vacuum to complete the pretreatment;

[0021] S2: Prepare electrolyte: mix 1 part of sodium silicate, 2 parts of barium hydroxide, 3 parts of aluminum potassium manganate, 1 part of sodium bicarbonate, 3 parts of potassium dihydrogen phosphate, 8 parts of glycerol and 30 parts of water, and ultrasonically Treat for 15 minutes;

[0022] S3: Put the metal mold that has been pretreated in step S1 into the electrolyte, and connect direct current with a current density of 9A / dm 2 , the power-on time is 5min, and the reaction temperature is 15°C; then wash and dry for later use;

[0023] S4: Put the metal mold processed in step S3 into the ion nitriding furnace for nitriding treatment. The specific process parameters include: the electrode spacing is 20mm, the cathode bias voltage is ≤2...

Embodiment 2

[0026] S1: Sand blow the metal mold, then put it into an ultrasonic cleaning machine containing 12% water-based cleaning agent to clean for 20 minutes, and then clean it with distilled water and dry it in vacuum to complete the pretreatment;

[0027] S2: Prepare electrolyte: mix 3 parts of sodium silicate, 4 parts of barium hydroxide, 6 parts of potassium aluminum manganate, 5 parts of sodium bicarbonate, 8 parts of potassium dihydrogen phosphate, 12 parts of glycerol and 50 parts of water, and ultrasonically Treat for 25 minutes;

[0028] S3: Put the metal mold that has been pretreated in step S1 into the electrolyte, and connect direct current with a current density of 15A / dm 2 , the power-on time is 10min, and the reaction temperature is 25°C; then wash and dry for later use;

[0029] S4: Put the metal mold processed in step S3 into the ion nitriding furnace for nitriding treatment. The specific process parameters include: electrode spacing 30mm, cathode bias ≤ 200V, vacuu...

Embodiment 3

[0032] S1: Sand blow the metal mold, then put it into an ultrasonic cleaning machine containing 7% water-based cleaning agent for cleaning for 13 minutes, and then clean it with distilled water and dry it in vacuum to complete the pretreatment;

[0033] S2: Prepare electrolyte: mix 2 parts of sodium silicate, 3 parts of barium hydroxide, 4 parts of aluminum potassium manganate, 2 parts of sodium bicarbonate, 4 parts of potassium dihydrogen phosphate, 9 parts of glycerol and 35 parts of water, and ultrasonically Treat for 17min;

[0034] S3: Put the metal mold that has been pretreated in step S1 into the electrolyte, and connect direct current with a current density of 10A / dm 2 , the power-on time is 7min, and the reaction temperature is 18°C; then wash and dry for later use;

[0035] S4: Put the metal mold treated in step S3 into the ion nitriding furnace for nitriding treatment. The specific process parameters include: the electrode spacing is 22mm, the cathode bias voltage ...

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Abstract

The invention provides a surface strengthening process of a metal mold. The metal mold is subjected to sand blowing treatment, and the metal mold is put into a water-based cleaning agent ultrasonic cleaner for cleaning, cleaned with distilled water, and dried in a vacuum mode to complete pretreatment; electrolyte is prepared: sodium silicate, barium hydroxide, potassium aluminum oxide, sodium bicarbonate, monopotassium phosphate, glycerol and water are mixed, and ultrasonic treatment is carried out for 15-25 min; the metal mold is put into the electrolyte after pretreatment and is electrifiedwith direct current, the current density is 9-15 A / dm2, the electrifying time is 5-10 min, and the reaction temperature is 15-25 DEG C; the metal mold is cleaned and dried for later use; the metal mold which is subjected to front treatment sis put into an ion nitriding furnace for nitriding treatment, and the specific technological parameters comprise: the polar distance is 20-30 mm, the cathode bias is smaller than or equal to 200 V, the vacuum pressure is smaller than or equal to 3 Pa, the gas flow is 250-350 L / h, the nitriding pressure is 150-200 Pa, the nitriding temperature is 650-800 DEGC, and the nitriding time is 2-4 h; and after the nitriding is completed and cooling is carried out, the metal mold with the surface subjected to reinforcement treatment can be obtained.

Description

technical field [0001] The invention relates to the technical field of metal mold preparation, in particular to a metal mold surface strengthening process. Background technique [0002] Mold accessories refer to the general term for metal accessories used in stamping molds, plastic molds or FA automation equipment exclusively in the mold industry. Mold accessories include: punch pin, punch, guide post, guide sleeve, thimble, cylinder, steel ball sleeve, oil-free guide sleeve, oil-free slide plate, guide post components, etc. The guide post is used in the mold and used in combination with components to ensure the precise positioning of the mold for movement and to guide the mold stroke. The biggest challenge encountered in the use of metal mold guide posts is the damage and failure of the surface caused by wear, fatigue, corrosion, etc. Therefore, the actual engineering application has higher requirements on the surface hardness, wear resistance, precision and smoothness of...

Claims

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Application Information

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IPC IPC(8): C23C8/36C23C8/02C25F1/04
Inventor 严国伟
Owner 苏州国立塑料制品有限公司
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