CN112975305A - Processing technology of plate A and plate B in die-casting die frame - Google Patents
Processing technology of plate A and plate B in die-casting die frame Download PDFInfo
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- CN112975305A CN112975305A CN202110393502.5A CN202110393502A CN112975305A CN 112975305 A CN112975305 A CN 112975305A CN 202110393502 A CN202110393502 A CN 202110393502A CN 112975305 A CN112975305 A CN 112975305A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a processing technology of an A plate and a B plate in a die-casting die carrier, which comprises the following processing steps: blanking: cutting the large steel plate into a rectangular workpiece for manufacturing the die carrier by using a sawing machine; rough machining: firstly, milling, then grinding, and correcting the verticality of six surfaces; and (3) first fine machining: cutting a rectangular workpiece to open a cavity, and then punching blank holes on the rectangular workpiece; and (3) heat treatment: quenching and tempering are carried out firstly; nitriding: carrying out nitriding treatment on the rectangular workpiece, and then air-cooling to room temperature; and (3) secondary fine machining: and milling and punching the rectangular workpiece. The invention has the advantages that: the A plate and the B plate have higher thermal stability, wear resistance, fatigue resistance, corrosion resistance and structural precision.
Description
Technical Field
The invention relates to a processing technology of a plate A and a plate B in a die-casting die frame.
Background
The injection mould frame is a semi-finished product of a die-casting mould and consists of various steel plates matched with parts, so to speak, the framework of the whole die-casting mould. The die-casting die frame comprises: the upper fixing plate, the plate A, the plate B, the top plate and the lower fixing plate are respectively provided with a cavity, an upper mold core is arranged in the cavity of the plate A, a lower mold core is arranged in the cavity of the plate B, and the upper mold core and the lower mold core can be driven to be closed together when the plate A and the plate B are closed. The A plate and the B plate are affected by complex stress and temperature change in the die-casting process, and the working conditions are poor and the failure modes are complex. Therefore, it is required that the A plate and the B plate have high physical properties, fatigue resistance and corrosion resistance.
Disclosure of Invention
The invention aims to provide a processing technology of an A plate and a B plate in a die-casting die frame, which can improve the physical properties, the fatigue resistance and the corrosion resistance of the A plate and the B plate.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the processing technology of the plate A and the plate B in the die-casting die frame is characterized in that: the processing steps are as follows:
blanking: cutting a large steel plate into a rectangular workpiece for manufacturing a die carrier by using a sawing machine, and reserving a machining allowance of 5-6 mm on the rectangular workpiece;
rough machining: milling six surfaces of a rectangular workpiece by using a milling machine, reserving machining allowance of 3-4 mm, grinding the six surfaces of the rectangular workpiece by using a grinding machine, reserving machining allowance of 1.5-2 mm, and correcting the verticality of the six surfaces to ensure that the three adjacent surfaces are mutually vertical;
and (3) first fine machining: cutting and opening a cavity of a rectangular workpiece by using a frame opening machine, reserving a machining allowance of 1.5mm in an inner cavity formed after the cavity is opened, and then punching a blank hole in the rectangular workpiece by using a machining center, wherein the diameter of the blank hole is 0.5-1 mm smaller than that of a standard hole;
and (3) heat treatment: firstly, quenching, namely heating a rectangular workpiece to 920-1050 ℃, preserving heat for 2-3 hours, then placing the rectangular workpiece into quenching liquid for rapid cooling, then tempering, heating the quenched rectangular workpiece to 150-250 ℃, preserving heat for 3-4 hours, and then air cooling to room temperature;
nitriding: putting the rectangular workpiece after heat treatment into a nitriding furnace, discharging and diluting air in the nitriding furnace by ammonia gas, dissolving urea in industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, keeping the temperature for 24 hours, and cooling to room temperature;
and (3) secondary fine machining: and (3) placing the nitrided rectangular workpiece in a machining center for milling and punching, cutting the inner cavity and six faces of the rectangular workpiece to reach the size required by production, and reaming or tapping the corresponding batch holes according to the production requirement to finally obtain the plate A or the plate B meeting the production requirement.
Further, according to the processing technology of the plate A and the plate B in the die-casting die frame, in the quenching process, the quenching transfer time of the rectangular workpiece does not exceed 30 s.
Further, in the processing technology of the plate A and the plate B in the die-casting die carrier, the quenching liquid needs to be in a flowing state in the quenching process, the temperature of the quenching liquid is not higher than 20 ℃ when the quenching is started, and the temperature of the quenching liquid is not higher than 30 ℃ when the quenching is finished.
Further, according to the processing technology of the plate A and the plate B in the die-casting die frame, before nitriding, the surface of a rectangular workpiece needs to be polished and cleaned by gasoline, alcohol or carbon tetrachloride, and the cleaning time is not less than 2 hours.
Further, according to the processing technology of the plate A and the plate B in the die-casting die frame, the rectangular workpiece is cooled along with the nitriding furnace, nitrogen needs to be supplied continuously in the cooling process, and when the temperature of the nitriding furnace is reduced to 200 ℃ or below, the nitrogen supply can be stopped.
Further, in the processing technology of the plate A and the plate B in the die-casting die mould base, a nitriding finish turning blade made of 38CrMoAlA is adopted to process the rectangular workpiece during secondary finish machining.
The invention has the advantages that: after heat treatment, the mechanical properties of the plate A and the plate B are improved, the plate A and the plate B are enabled to have higher thermal stability, wear resistance and fatigue resistance, and after nitridation treatment, the fatigue resistance and wear resistance of the plate A and the plate B are further improved, and a passivation film is formed on the plate A and the plate B, so that the plate A and the plate B have higher corrosion resistance and are not easy to rust in the using process. After the heat treatment and the nitriding treatment, the A plate and the B plate slightly deform, and the deformation of the A plate and the B plate can be eliminated by performing secondary fine machining, so that the structural accuracy of the A plate and the B plate is improved.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific examples.
The invention relates to a processing technology of a plate A and a plate B in a die-casting die carrier, which comprises the following processing steps:
blanking: cutting a large steel plate into a rectangular workpiece for manufacturing a die carrier by using a sawing machine, and reserving a machining allowance of 5-6 mm on the rectangular workpiece;
rough machining: milling six surfaces of a rectangular workpiece by using a milling machine, reserving machining allowance of 3-4 mm, grinding the six surfaces of the rectangular workpiece by using a grinding machine, reserving machining allowance of 1.5-2 mm, and correcting the verticality of the six surfaces to ensure that the three adjacent surfaces are mutually vertical;
and (3) first fine machining: cutting and opening a cavity of a rectangular workpiece by using a frame opening machine, reserving a machining allowance of 1.5mm in an inner cavity formed after the cavity is opened, and then punching a blank hole in the rectangular workpiece by using a machining center, wherein the diameter of the blank hole is 0.5-1 mm smaller than that of a standard hole;
and (3) heat treatment: quenching, namely heating a rectangular workpiece to 920-1050 ℃, preserving heat for 2-3 hours, then placing the rectangular workpiece into quenching liquid for rapid cooling, wherein in the quenching process, the quenching transfer time of the rectangular workpiece is not more than 30s, the quenching liquid needs to be in a flowing state when the rectangular workpiece is quenched, the temperature of the quenching liquid is not higher than 20 ℃ when quenching is started, and the temperature of the quenching liquid is not higher than 30 ℃ when quenching is finished; then tempering, namely heating the rectangular workpiece after quenching to 150-250 ℃, preserving heat for 3-4 hours, and then cooling in air to room temperature;
nitriding: before nitriding, the surface of a rectangular workpiece needs to be polished and cleaned by gasoline, alcohol or carbon tetrachloride for at least 2h, so that the surface of the rectangular workpiece is smooth and pollution-free; putting the rectangular workpiece after heat treatment into a nitriding furnace, discharging and diluting air in the nitriding furnace by ammonia gas, dissolving urea in industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ for 24 hours when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, cooling the rectangular workpiece together with the nitriding furnace to room temperature, continuously supplying nitrogen during the cooling process, and stopping nitrogen supply when the temperature of the nitriding furnace is reduced to 200 ℃ or below.
And (3) secondary fine machining: and placing the nitrided rectangular workpiece in a machining center for milling and punching, cutting the inner cavity and six faces of the rectangular workpiece to reach the size required by production, reaming or tapping the corresponding batch holes according to the production requirement to finally obtain an A plate or a B plate meeting the production requirement, and machining the rectangular workpiece by adopting a nitriding finish turning machining blade made of 38CrMoAlA during secondary finish machining.
The invention has the advantages that: after heat treatment, the mechanical properties of the plate A and the plate B are improved, the plate A and the plate B are enabled to have higher thermal stability, wear resistance and fatigue resistance, and after nitridation treatment, the fatigue resistance and wear resistance of the plate A and the plate B are further improved, and a passivation film is formed on the plate A and the plate B, so that the plate A and the plate B have higher corrosion resistance and are not easy to rust in the using process. After the heat treatment and the nitriding treatment, the A plate and the B plate slightly deform, and the deformation of the A plate and the B plate can be eliminated by performing secondary fine machining, so that the structural accuracy of the A plate and the B plate is improved.
Claims (6)
1. The processing technology of the plate A and the plate B in the die-casting die frame is characterized in that: the processing steps are as follows:
blanking: cutting a large steel plate into a rectangular workpiece for manufacturing a die carrier by using a sawing machine, and reserving a machining allowance of 5-6 mm on the rectangular workpiece;
rough machining: milling six surfaces of a rectangular workpiece by using a milling machine, reserving machining allowance of 3-4 mm, grinding the six surfaces of the rectangular workpiece by using a grinding machine, reserving machining allowance of 1.5-2 mm, and correcting the verticality of the six surfaces to ensure that the three adjacent surfaces are mutually vertical;
and (3) first fine machining: cutting and opening a cavity of a rectangular workpiece by using a frame opening machine, reserving a machining allowance of 1.5mm in an inner cavity formed after the cavity is opened, and then punching a blank hole in the rectangular workpiece by using a machining center, wherein the diameter of the blank hole is 0.5-1 mm smaller than that of a standard hole;
and (3) heat treatment: firstly, quenching, namely heating a rectangular workpiece to 920-1050 ℃, preserving heat for 2-3 hours, then placing the rectangular workpiece into quenching liquid for rapid cooling, then tempering, heating the quenched rectangular workpiece to 150-250 ℃, preserving heat for 3-4 hours, and then air cooling to room temperature;
nitriding: putting the rectangular workpiece after heat treatment into a nitriding furnace, discharging and diluting air in the nitriding furnace by ammonia gas, dissolving urea in industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, keeping the temperature for 24 hours, and cooling to room temperature;
and (3) secondary fine machining: and (3) placing the nitrided rectangular workpiece in a machining center for milling and punching, cutting the inner cavity and six faces of the rectangular workpiece to reach the size required by production, and reaming or tapping the corresponding batch holes according to the production requirement to finally obtain the plate A or the plate B meeting the production requirement.
2. The processing technology of the plate A and the plate B in the die-casting die carrier according to claim 1, characterized in that: in the quenching process, the quenching transfer time of the rectangular workpiece is not more than 30 s.
3. The process for machining the plate a and the plate B in the die-casting die carrier according to claim 1 or 2, wherein: in the quenching process, the quenching liquid needs to be in a flowing state, the temperature of the quenching liquid is not higher than 20 ℃ when the quenching is started, and the temperature of the quenching liquid is not higher than 30 ℃ when the quenching is finished.
4. The processing technology of the plate A and the plate B in the die-casting die carrier according to claim 1, characterized in that: before nitriding, the surface of a rectangular workpiece needs to be polished and cleaned by gasoline, alcohol or carbon tetrachloride for at least 2 h.
5. The processing technology of the plate A and the plate B in the die-casting die carrier according to claim 1, characterized in that: the rectangular workpiece is cooled along with the nitriding furnace, nitrogen is required to be supplied continuously in the cooling process, and the nitrogen supply can be stopped when the temperature of the nitriding furnace is reduced to 200 ℃ or below.
6. The processing technology of the plate A and the plate B in the die-casting die carrier according to claim 1, characterized in that: and a nitriding finish turning blade made of 38CrMoAlA is adopted to machine the rectangular workpiece during secondary finish machining.
Priority Applications (1)
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| CN202110393502.5A CN112975305A (en) | 2021-04-13 | 2021-04-13 | Processing technology of plate A and plate B in die-casting die frame |
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| CN202110393502.5A CN112975305A (en) | 2021-04-13 | 2021-04-13 | Processing technology of plate A and plate B in die-casting die frame |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113652527A (en) * | 2021-08-14 | 2021-11-16 | 张家港市品杰模塑科技有限公司 | Production process of plastic die steel |
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| US5205466A (en) * | 1992-07-15 | 1993-04-27 | Chieh-Chang Tzeng | Manufacturing method of austenitic stainless steel self-tapping and self-drilling screw |
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| CN113652527A (en) * | 2021-08-14 | 2021-11-16 | 张家港市品杰模塑科技有限公司 | Production process of plastic die steel |
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