CN109702442B - Manufacturing method of precise and rapid forming automobile electronic die - Google Patents
Manufacturing method of precise and rapid forming automobile electronic die Download PDFInfo
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Abstract
The invention relates to the technical field of injection molds, in particular to a manufacturing method of a precise and rapid molding automobile electronic mold, which comprises the following steps: putting the prepared raw materials into a vacuum smelting furnace for smelting at 1240 and 1350 ℃ for 3-5 h; casting the smelted molten steel into an ingot, cooling to the temperature of 220-; sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel, carrying out heat treatment and cutting forming, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, thus obtaining the precise and rapid forming automobile electronic die; the die produced by the invention has the advantages of high precision, strong hardness, strong corrosion resistance, firmness and wear resistance.
Description
Technical Field
The invention relates to the technical field of injection molds, in particular to a manufacturing method of a precise and rapid molding automobile electronic mold.
Background
In recent years, with the rapid development and general use of the plastic industry, the application range of plastic products is continuously expanded due to the continuous improvement of engineering plastics in the aspects of strength, precision and the like, such as household appliances, instruments, building equipment, automobile industry, daily hardware and other fields, the proportion of the plastic products is rapidly increased, particularly the application in the automobile industry, and with the rapid development of the automobile industry, the market prospect of automobile electronic molds is also seen unprecedentedly.
A precision injection mold is a device in which a resin material is injected into a metal mold to obtain a product having a predetermined shape. In fact, in order to control the temperature of the mold, there are also devices such as cooling holes for passing a refrigerant, heaters, and the like. The material which becomes melt enters the main runner, passes through the sub-runners and the sprue and is injected into the die cavity. After the cooling stage, the mold is opened, and the ejector rod is ejected out by the ejector device on the forming machine to push out the product. The molded article is composed of a main runner for flowing a molten resin, a sub-runner for guiding the molten resin into a cavity, and a product. At least more than half of the high-precision injection molds used in China are imported from abroad at present, and the domestic injection molds cause the phenomena of shrinkage rate error, injection deformation, demoulding deformation, edge overflow and the like of injection products due to the problems of precision, hardness and other aspects, so that a new mold preparation method is needed to solve the problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a manufacturing method of a precise and rapid forming automobile electronic mold. The die produced by the invention has the advantages of high precision, strong hardness, strong corrosion resistance, firmness and wear resistance.
A manufacturing method of a precise and rapid forming automobile electronic mold comprises the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the step one into a vacuum smelting furnace for smelting, wherein the smelting temperature is 1240 and 1350 ℃, and the smelting time is 3-5 h;
step three: casting the smelted molten steel into ingots, cooling to the temperature of 220-;
step four: cooling the steel ingot obtained in the step three to the temperature of 220-240 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at the temperature of 660-680 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the step five to the temperature of 600-650 ℃ in a vacuum furnace, and preserving heat for 1.5h, and then heating to the temperature of 800-820 ℃ for preserving heat for 1.2-1.5 h; then quenching and heating are carried out, the heating temperature is 980 and 1020 ℃, the heat preservation is carried out for 1-1.5h, and then oil cooling is carried out; finally, tempering treatment is carried out for three times continuously, the temperature is controlled between 300 ℃ and 550 ℃, and each tempering is carried out after the furnace is taken out, air cooling is carried out to 20-25 ℃, and then next tempering is carried out;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, so as to obtain the precise and rapid molded automobile electronic die.
Further, the raw materials of the die in the first step comprise the following components in parts by weight:
further, 1.2-2.5g/L ammonia gas is added into the vacuum furnace in the smelting process in the second step.
Further, adding 6-9 parts by weight of ferrochrome nitride into the molten steel when the smelting temperature reaches 660 ℃ in the second step.
Further, the third tempering temperature in the fifth step is 360 ℃, 420 ℃ and 280 ℃.
Further, the thickness of the seven-diamond transition layer film is 0.2-0.4 mm.
Advantageous effects
The invention has the following beneficial effects:
(1) the invention adopts the die raw material, wherein carbon is one of the most main elements influencing the strength of steel, the strength is higher when the carbon content is higher, and the carbon content is properly controlled according to the middle upper limit of the requirement, so the C content is controlled within the range of 14-18 parts during production, phosphorus is an easily-segregated element in steel, when the phosphorus content is more than 5 parts by weight, the segregation of phosphorus can be increased rapidly, the hardness of a segregation zone is increased, and the performance of a steel plate is uneven, according to the product performance requirement and the actual process control level of a steel mill, the phosphorus content is controlled below 5 parts by weight during production, chromium can effectively improve the corrosion resistance and wear resistance of the steel, the chromium content is controlled within the range of 5-9 parts by combining the use requirement of die steel during actual production, manganese oxide is an effective reinforcing agent, and the creep strength of the steel can be improved to the extent of being capable of being used at about 600 ℃, while preventing temper embrittlement.
(2) According to the invention, 6-9 parts by weight of ferrochrome nitride is added into the molten steel when the smelting temperature reaches 660 ℃, and the ferrochrome nitride can replace the shortage of nickel for smelting, so that the cost is saved, and the corrosion resistance of the die steel is enhanced; the invention adopts three times of continuous tempering treatment, thus strengthening the wear resistance, corrosion resistance and toughness of the die.
(3) The diamond-like transition layer film is attached to the surface of the die, the transition layer has a great improvement effect on the material resources and chemical characteristics of the surface of the die, and endows the die with self-lubricating property, corrosion resistance, wear resistance and proper surface hardness, the self-lubricating property has a release agent effect on the release of a processed material in the production process, the self-lubricating property plays a good protection effect on the corrosion of acid and alkali liquor during surface cleaning of the die, and meanwhile, the wear resistance and hardness are improved, so that the wear and deformation of the die are reduced, and the service life of the die is prolonged.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A manufacturing method of a precise and rapid forming automobile electronic mold comprises the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the first step into a vacuum smelting furnace for smelting, adding 2.5g/L ammonia gas into the vacuum furnace in the smelting process, adding 9 parts by weight of ferrochromium nitride into molten steel when the smelting temperature reaches 660 ℃, and continuing smelting, wherein the smelting temperature is 1350 ℃, and the smelting time is 5 hours;
step three: casting the smelted molten steel into ingots, cooling to 240 ℃, preserving heat for 1.5h, then heating to 630 ℃, preserving heat for 55min, and obtaining steel ingots;
step four: cooling the steel ingot obtained in the step three to 240 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at the temperature of 680 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the fifth step to 650 ℃ in a vacuum furnace, preserving heat for 1.5h, and then heating to 820 ℃ and preserving heat for 1.5 h; then quenching and heating are carried out, the heating temperature is 1020 ℃, the heat preservation is carried out for 1.5h, and then oil cooling is carried out; finally, tempering treatment is carried out for three times continuously, the temperature is controlled to be 550 ℃, each time of tempering is carried out, the furnace is discharged, air cooling is carried out to 25 ℃, and then next tempering is carried out, wherein the three tempering temperatures are respectively 360 ℃, 420 ℃ and 280 ℃;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, wherein the thickness of the diamond-like transition layer film is 0.2mm, so that the precise and rapid molded automobile electronic die is obtained.
Example 2
A manufacturing method of a precise and rapid forming automobile electronic mold comprises the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the first step into a vacuum smelting furnace for smelting, adding 1.4g/L ammonia gas into the vacuum furnace in the smelting process, adding 7 parts by weight of chromium nitride iron into molten steel when the smelting temperature reaches 660 ℃, and continuing smelting, wherein the smelting temperature is 1280 ℃, and the smelting time is 4 hours;
step three: casting the smelted molten steel into ingots, cooling to 225 ℃, preserving heat for 1.2h, then heating to 570 ℃, and preserving heat for 30-55min to obtain steel ingots;
step four: cooling the steel ingot obtained in the step three to 225 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at the temperature of 665 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the step five to 620 ℃ in a vacuum furnace, preserving heat for 1.5h, and then heating to 800-820 ℃ for preserving heat for 1.3 h; quenching and heating at 990 ℃ for 1.2h, and cooling with oil; finally, tempering treatment is carried out for three times continuously, the temperature is controlled to be 370 ℃, each time of tempering is carried out, the furnace is discharged, air cooling is carried out to 22 ℃, and then next tempering is carried out, wherein the three tempering temperatures are respectively 360 ℃, 420 ℃ and 280 ℃;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, wherein the thickness of the diamond-like transition layer film is 0.2mm, so that the precise and rapid molded automobile electronic die is obtained.
Example 3
A manufacturing method of a precise and rapid forming automobile electronic mold comprises the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the step one into a vacuum smelting furnace for smelting, adding 1.8g/L ammonia gas into the vacuum furnace in the smelting process, adding 7 parts by weight of chromium nitride iron into molten steel when the smelting temperature reaches 660 ℃, and continuing smelting, wherein the smelting temperature is 1300 ℃, and the smelting time is 4 hours;
step three: casting the smelted molten steel into ingots, cooling to 230 ℃, preserving heat for 1.3h, then heating to 590 ℃, and preserving heat for 42min to obtain steel ingots;
step four: cooling the steel ingot obtained in the step three to 230 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at the temperature of 670 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the fifth step to 625 ℃ in a vacuum furnace, and preserving heat for 1.5h, and then heating to 810 ℃ and preserving heat for 1.3 h; quenching and heating at 1000 ℃ and keeping the temperature for 1.3h, and then carrying out oil cooling; finally, tempering treatment is carried out for three times continuously, the temperature is controlled to be 425 ℃, each tempering is carried out after the furnace is taken out, air cooling is carried out to 20-25 ℃, and then next tempering is carried out, wherein the three tempering temperatures are respectively 360 ℃, 420 ℃ and 280 ℃;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, wherein the thickness of the diamond-like transition layer film is 0.3mm, so that the precise and rapid molded automobile electronic die is obtained.
Example 4
A manufacturing method of a precise and rapid forming automobile electronic mold comprises the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the step one into a vacuum smelting furnace for smelting, adding 2.4/L ammonia gas into the vacuum furnace in the smelting process, adding 8 parts by weight of chromium nitride iron into molten steel when the smelting temperature reaches 660 ℃, and continuing smelting, wherein the smelting temperature is 1320 ℃, and the smelting time is 4 hours;
step three: casting the smelted molten steel into an ingot, cooling to 230 ℃, preserving heat for 1.4h, then heating to 620 ℃, preserving heat for 52min, and obtaining a steel ingot;
step four: cooling the steel ingot obtained in the step three to 235 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at 675 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the fifth step to 640 ℃ in a vacuum furnace, preserving heat for 1.5h, and then heating to 815 ℃ and preserving heat for 1.4 h; quenching and heating at 1010 ℃ for 1.4h, and cooling with oil; finally, tempering treatment is carried out for three times continuously, the temperature is controlled to be 530 ℃, each time of tempering is carried out, the furnace is discharged, air cooling is carried out to 24 ℃, then next tempering is carried out, and the three tempering temperatures are respectively 360 ℃, 420 ℃ and 280 ℃;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, wherein the thickness of the diamond-like transition layer film is 0.4mm, so that the precise and rapid molded automobile electronic die is obtained.
Example 5
A manufacturing method of a precise and rapid forming automobile electronic mold comprises the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the first step into a vacuum smelting furnace for smelting, adding 2.5g/L ammonia gas into the vacuum furnace in the smelting process, adding 9 parts by weight of ferrochromium nitride into molten steel when the smelting temperature reaches 660 ℃, and continuing smelting, wherein the smelting temperature is 1350 ℃, and the smelting time is 5 hours;
step three: casting the smelted molten steel into ingots, cooling to 240 ℃, preserving heat for 1.5h, then heating to 630 ℃, preserving heat for 55min, and obtaining steel ingots;
step four: cooling the steel ingot obtained in the step three to 240 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at the temperature of 680 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the fifth step to 650 ℃ in a vacuum furnace, preserving heat for 1.5h, and then heating to 820 ℃ and preserving heat for 1.5 h; then quenching and heating are carried out, the heating temperature is 1020 ℃, the heat preservation is carried out for 1.5h, and then oil cooling is carried out; finally, tempering treatment is carried out for three times continuously, the temperature is controlled to be 550 ℃, each time of tempering is carried out, the furnace is discharged, air cooling is carried out to 25 ℃, and then next tempering is carried out, wherein the three tempering temperatures are respectively 360 ℃, 420 ℃ and 280 ℃;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, wherein the thickness of the diamond-like transition layer film is 0.4mm, so that the precise and rapid molded automobile electronic die is obtained.
Comparative example 1
Comparative example 1 differs from example 2 in that comparative example 1 does not have a diamond-like transition layer film attached.
The test results of the hardness and the wear resistance of the precision rapid prototyping automobile electronic type molds prepared in the examples 1 to 5 and the comparative example 1 are shown in the following table:
| item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 |
| Hardness of | 2.24 | 2.31 | 2.28 | 2.25 | 2.23 | 1.82 |
| Relative wear resistance | 1.06 | 1.2 | 1.18 | 1.12 | 1.14 | 1.04 |
The hardness testing method comprises the following steps: GB/T230.1-2004 "Metal Rockwell hardness test part 1: test methods ";
the relative wear resistance test method comprises the following steps: the weight loss of the sample is W-W original-W abrasion, and the two materials can be compared after abrasion test under the same condition, namely the relative abrasion resistance S is the abrasion loss of the sample to be measured and the abrasion loss of the standard sample is H62 brass.
From the above tabulated data, the important effects of the diamond-like transition layer film on wear resistance and hardness can be seen, and each item of data of example 2 is the best, and is the best embodiment.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A manufacturing method of a precise and rapid forming automobile electronic mold is characterized by comprising the following steps:
the method comprises the following steps: preparing the raw materials of the die according to the following components in parts by weight:
step two: putting the prepared raw materials in the step one into a vacuum smelting furnace for smelting, wherein 1.2-2.5g/L ammonia gas is added into the vacuum furnace in the smelting process, the smelting temperature is 1240 and 1350 ℃, and the smelting time is 3-5 h;
step three: casting the smelted molten steel into ingots, cooling to the temperature of 220-;
step four: cooling the steel ingot obtained in the step three to the temperature of 220-240 ℃, rolling the steel ingot into an initial blank, and grinding the initial blank at the temperature of 660-680 ℃;
step five: sequentially carrying out forming rolling, widening rolling and finish rolling on the ground primary blank to obtain die steel;
step six: preheating the die steel obtained in the step five to the temperature of 600-650 ℃ in a vacuum furnace, and preserving heat for 1.5h, and then heating to the temperature of 800-820 ℃ for preserving heat for 1.2-1.5 h; then quenching and heating are carried out, the heating temperature is 980 and 1020 ℃, the heat preservation is carried out for 1-1.5h, and then oil cooling is carried out; finally, tempering treatment is carried out for three times continuously, the temperature is controlled between 300 ℃ and 550 ℃, and each tempering is carried out after the furnace is taken out, air cooling is carried out to 20-25 ℃, and then next tempering is carried out;
step seven: and (3) cutting, machining and molding the die steel, and depositing carbon atoms on the surface of the die by using a sputtering machine to form a diamond-like transition layer film, wherein the thickness of the diamond-like transition layer film is 0.2-0.4mm, so that the precise and rapid molded automobile electronic die is obtained.
2. The manufacturing method of the precise and rapid forming automobile electronic mold according to claim 1, wherein the raw materials of the mold in the first step comprise the following components in parts by weight:
3. the method for manufacturing the precise and rapid forming automobile electronic mold according to claim 1, wherein 6 to 9 parts by weight of ferrochrome nitride is added into the molten steel when the melting temperature reaches 660 ℃ in the second step.
4. The method for manufacturing the precise and rapid prototyping automobile electronic mold as recited in claim 1, wherein the third tempering temperature in the fifth step is 360 ℃, 420 ℃ and 280 ℃.
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