Self-lubricating extrusion die material for aluminum profile machining and method for manufacturing extrusion die

A technology for processing aluminum profiles and extruding molds, which is applied in the field of mold manufacturing, can solve the problems of cavity wear, extrusion mold cavity out-of-tolerance time, high production costs, etc., to reduce friction and wear, and avoid surface nitriding process , the effect of improving production efficiency

Pending Publication Date: 2022-02-15

XIAN UNIV OF TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-lubricating extrusion die material for aluminum profile processing, which solves the serious cavity wear of...

Method used

[0050] The matrix of the present invention is distributed with 500 pieces/mm2 and free graphite with a spheroidiz...

Abstract

The invention discloses a self-lubricating extrusion die material for aluminum profile machining and a method for manufacturing an extrusion die. The self-lubricating extrusion die material is prepared from, by mass, 2.5%-4.0% of C, 2.2%-3.2% of Si, 0.3%-1.3% of Mn, 1.0%-2.0% of Ni, 0.5%-1.5% of Cu, smaller than or equal to 0.03% of Mg, smaller than or equal to 0.03% of P, smaller than or equal to 0.03% of S and the balance Fe, and the sum of the mass percentages of the components is 100%. According to the invention, the problems that serious cavity abrasion is generated in the high-load sliding friction process of an existing extrusion die, the cavity abrasion out-of-tolerance time of the extrusion die is short, and the production cost is high are solved.

Application Domain

Extrusion diesHeat treatment baths

Technology Topic

ExtrusionMachining +1

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Examples

Experimental program(5)

Example Embodiment

[0039] Example 1

[0040] The present invention also provides a method for manufacturing an extrusion die by using the self-lubricating extrusion die material for aluminum profile processing, which is specifically implemented according to the following steps:

[0041] Step 1: Weigh the following components according to mass percentage: C 4.0%, Si 2.2%, Mn 1.3%, Ni 2.0%, Cu 1.5%, Mg0.03%, P0.03%, S0.03%, the balance is Fe, the sum of the mass percentages of the above components is 100%;

[0042] Step 2, the material weighed in step 1 is smelted in a high-temperature smelting furnace with a temperature of 1520 ° C until it is completely melted to obtain mixed molten iron;

[0043] In step 3, the mixed molten iron obtained in step 2 is poured into the preheated continuous casting machine supporting holding furnace through a transfer bag for heat preservation, and a ferrosilicon spheroidizing agent and a rare earth inoculant are added for spheroidization and inoculation to obtain production molten iron;

[0044] Among them, the preheating temperature is 630℃, and the holding time is 35min;

[0045] The added mass of ferrosilicon nodularizing agent is 1.4% of the mass of the mixed molten iron obtained in step 2, and the added mass of rare earth inoculant is 1.4% of the mass of the mixed molten iron obtained in step 2;

[0046] Step 4, the production molten iron obtained in step 3 is quenched through a mold installed on the continuous casting machine, the size of the mold is 6 mm larger than the maximum outer diameter of the extrusion die, and the chilled production molten iron begins to condense from the surface layer, and gradually The center part is solidified, and the solidification time of the whole section is 14min, and then the as-cast steel billet is formed by horizontally pulling out the dummy rod at a speed of 2cm/min, and the self-lubricating extrusion die billet is obtained;

[0047] In step 5, the self-lubricating extrusion die blank obtained in step 4 is sized according to the size of the extrusion die, and then the sized blank is turned externally rounded and cavity-milled by CNC milling machine and wire cutting to obtain extrusion. For the die blank, keep the extrusion die blank at a temperature of 950 °C for 30 minutes, then take out the extrusion die blank and lift it to a nitrate tank with a temperature of 390 °C for 35 minutes. The residual nitrate on the surface is cleaned to obtain an extrusion die;

[0048] In step 6, the hardness test is performed on the extrusion die obtained in step 5, and the qualified range of the hardness test is HRC30-48. After passing the test, the mold cavity is ground and polished according to the drawing of the extrusion die to obtain aluminum profile processing. Self-lubricating extrusion dies.

[0049] figure 1 This is the scanning electron microscope photo of the matrix structure of the extrusion die obtained after the heat treatment in step 5. It can be seen that the matrix of the extrusion die is composed of ferrite, supersaturated austenite and graphite, and the supersaturated austenite is induced by stress. Can be transformed into martensite.

[0050] There are 500 pieces/mm distributed in the matrix of the present invention 2 And free graphite with a spheroidization level of 2 or higher, thereby reducing the friction and wear between the mold cavity and the aluminum profile.

[0051] The self-lubricating extrusion die blank obtained in step 4 is compared with the aluminum alloy friction test carried out by the DC53 die steel imported from Japan. The self-lubricating extrusion die blank obtained by the invention has obvious advantages of low friction and inhibits aluminum sticking, and the amount of sticking aluminum is reduced by more than 50%, which can not only improve the surface processing quality of the aluminum alloy, but also effectively prolong the life of the die.

Example Embodiment

[0052] Example 2

[0053] The present invention also provides a method for manufacturing an extrusion die by using the self-lubricating extrusion die material for aluminum profile processing, which is specifically implemented according to the following steps:

[0054] Step 1, weigh the following components according to mass percentage: C 2.5%, Si 3.2%, Mn 0.3%, Ni 1.0%, Cu 0.5%, Mg 0.01%, P 0.01%, S0.01%, the balance is Fe, The sum of the mass percentages of the above components is 100%;

[0055] Step 2, the material weighed in step 1 is smelted in a high-temperature smelting furnace with a temperature of 1320 ° C until it is completely melted to obtain mixed molten iron;

[0056] In step 3, the mixed molten iron obtained in step 2 is poured into the preheated continuous casting machine supporting holding furnace through a transfer bag for heat preservation, and a ferrosilicon spheroidizing agent and a rare earth inoculant are added for spheroidization and inoculation to obtain production molten iron;

[0057] Among them, the preheating temperature is 830℃, and the holding time is 20min;

[0058] The added mass of ferrosilicon nodularizing agent is 2.9% of the mass of the mixed molten iron obtained in step 2, and the added mass of rare earth inoculant is 2.9% of the mass of the mixed molten iron obtained in step 2;

[0059] Step 4, the production molten iron obtained in step 3 is quenched through a mold installed on the continuous casting machine, the size of the mold is 8mm larger than the maximum outer diameter of the extrusion die, and the chilled production molten iron starts to condense from the surface layer, and gradually The center part is solidified, and the solidification time of the whole section is 6min, and then the as-cast steel billet is formed by horizontally pulling out the dummy rod at a speed of 5cm/min, and the self-lubricating extrusion die billet is obtained;

[0060] In step 5, the self-lubricating extrusion die blank obtained in step 4 is sized according to the size of the extrusion die, and then the sized blank is turned externally rounded and cavity-milled by CNC milling machine and wire cutting to obtain extrusion. For the die blank, keep the extrusion die blank at a temperature of 800°C for 90 minutes, then take out the extrusion die blank and hoist it to a nitrate tank with a temperature of 220°C for 120 minutes. The residual nitrate on the surface is cleaned to obtain an extrusion die;

[0061] Step 6, respectively carry out hardness test on the extrusion die obtained in step 5. The qualified range of hardness test is HRC48-50. After passing the test, grind and polish the cavity of the die according to the drawing of the extrusion die to obtain aluminum profiles for processing. Self-lubricating extrusion dies.

Example Embodiment

[0062] Example 3

[0063] The present invention also provides a method for manufacturing an extrusion die by using the self-lubricating extrusion die material for aluminum profile processing, which is specifically implemented according to the following steps:

[0064] Step 1, weigh the following components according to mass percentage: C 3.3%, Si 2.8%, Mn 1.8%, Ni 1.5%, Cu1%, Mg0.02%, P0.02%, S0.02%, the balance is Fe, the sum of the mass percentages of the above components is 100%;

[0065] Step 2, smelting the material weighed in step 1 in a high-temperature smelting furnace with a temperature of 1400° C. to complete melting to obtain mixed molten iron;

[0066] In step 3, the mixed molten iron obtained in step 2 is poured into the preheated continuous casting machine supporting holding furnace through a transfer bag for heat preservation, and a ferrosilicon spheroidizing agent and a rare earth inoculant are added for spheroidization and inoculation to obtain production molten iron;

[0067] Among them, the preheating temperature is 720℃, and the holding time is 28min;

[0068] The added mass of ferrosilicon nodularizing agent is 2% of the mass of the mixed molten iron obtained in step 2, and the added mass of rare earth inoculant is 2% of the mass of the mixed molten iron obtained in step 2;

[0069] Step 4, the production molten iron obtained in step 3 is quenched through the mold installed on the continuous casting machine, the size of the mold is 7mm larger than the maximum outer diameter of the extrusion die, and the chilled production molten iron begins to condense from the surface layer, and gradually The center part is solidified, and the solidification time of the whole section is 10min, and then the as-cast steel billet is formed by horizontally pulling out the dummy rod at a speed of 3.5cm/min, and the self-lubricating extrusion die billet is obtained;

[0070] In step 5, the self-lubricating extrusion die blank obtained in step 4 is sized according to the size of the extrusion die, and then the sized blank is turned externally rounded and cavity-milled by CNC milling machine and wire cutting to obtain extrusion. For the die blank, keep the extrusion die blank at a temperature of 870°C for 60 minutes, then take out the extrusion die blank and hoist it to a nitrate tank with a temperature of 300°C for 75 minutes. The residual nitrate on the surface is cleaned to obtain an extrusion die;

[0071] Step 6, respectively carry out hardness test on the extrusion die obtained in step 5. The qualified range of hardness test is HRC48-50. After passing the test, grind and polish the cavity of the die according to the drawing of the extrusion die to obtain aluminum profiles for processing. Self-lubricating extrusion dies.

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Classification and recommendation of technical efficacy words

Reduce friction and wear

Self-lubricating extrusion die material for aluminum profile machining and method for manufacturing extrusion die

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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