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CN110480288B - Machining method of precision forging die for tibial platform artificial joint - Google Patents

Machining method of precision forging die for tibial platform artificial joint Download PDF

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CN110480288B
CN110480288B CN201910726789.1A CN201910726789A CN110480288B CN 110480288 B CN110480288 B CN 110480288B CN 201910726789 A CN201910726789 A CN 201910726789A CN 110480288 B CN110480288 B CN 110480288B
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die
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CN110480288A (en
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汤敏
李湘军
何涛
陈海钢
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Wuxi Hyatech Technology Co ltd
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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
    • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies

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Abstract

The invention provides a processing method of a precision forging die of a tibial plateau artificial joint, which can solve the problems that the structure of the existing precision forging die of the tibial plateau artificial joint is complex, the processing requirement is high, the conventional die processing method is used, the steps are multiple and complex, and the dimensional precision and the surface quality are difficult to ensure to be qualified. Which comprises the following steps: step 1, blanking; step 2, performing rough machining and semi-finish machining on the appearance of the mold blank; step 3, roughly processing a rod part cavity and a platform cavity on the die blank; step 4, quenching the die blank; step 5, performing finish machining on the shape of the mold blank; step 6, performing semi-finish machining and finish machining on the platform cavity and the rod part cavity by adopting high-speed milling; step 7, performing finish machining on the wing part cavity by adopting electrode machining; step 8, performing clamp repairing on tool joint marks of high-speed milling and electrode machining; and 9, nitriding the whole die.

Description

Machining method of precision forging die for tibial platform artificial joint
Technical Field
The invention relates to the field of processing of precision forging dies, in particular to a processing method of a precision forging die for a tibial plateau artificial joint.
Background
The artificial tibial plateau joint is a substitute of a damaged tibial plateau in a human knee joint, and can be implanted through an operation to restore the function of the joint and improve the life quality of a patient. Fig. 1 and 2 are schematic structural views of a tibial plateau artificial joint implant, which comprises a plateau 1, a wing part 2 and a rod part 3, wherein a U-shaped groove 4 is formed on the side part of the plateau 1.
With the continuous development of the society, the precision forging piece of the tibial plateau artificial joint implant is more and more widely used, and the size and the shape of the precision forging piece are ensured by a precision forging die. The precision forging die for the tibial plateau artificial joint comprises a platform die cavity, a wing part die cavity and a rod part die cavity which are communicated up and down, wherein each die cavity is formed by different curved surfaces, the rod part die cavity is a deep central hole, the wing part die cavity is deep and narrow, the shape of the curved surface at the bottom of the wing part die cavity is complex, the ratio of the depth of each die cavity to the width of the cross section of each die cavity reaches more than 6, the processing difficulty is very high, meanwhile, the precision forging die has high requirements on size precision and surface quality, and when the precision forging die is processed by using a conventional die processing method, not only are multiple and complex in steps, but also the size precision and the surface quality are difficult.
Disclosure of Invention
The invention provides a method for processing a precision forging die of a tibial plateau artificial joint, which has the advantages of simple steps, capability of reducing the manufacturing period and cost of the die and capability of effectively ensuring that the processing precision and the surface quality of the die meet the requirements.
The technical scheme is as follows: a processing method of a precision forging die of a tibial plateau artificial joint is characterized by comprising the following steps:
step 1, blanking, namely blanking a round steel bar of a die to obtain a die blank;
step 2, performing rough machining and semi-finish machining on the shape of the die blank, wherein machining allowance is reserved for the shape after the semi-finish machining relative to the theoretical size;
step 3, roughly machining the rod part cavity and the platform cavity on the die blank, and reserving machining allowance for the roughly machined rod part cavity and the roughly machined platform cavity relative to the theoretical size;
step 4, quenching the die blank, detecting the hardness, the size and the surface quality of the quenched die blank, and judging whether the die blank meets the requirements or not;
step 5, performing finish machining on the shape of the mold blank;
step 6, performing semi-finish machining and finish machining on the platform cavity and the rod part cavity by adopting high-speed milling;
step 7, performing finish machining on the wing part cavity by adopting electrode machining;
step 8, performing clamp repairing on tool joint marks of high-speed milling and electrode machining;
and 9, nitriding the whole die to complete the machining of the die.
It is further characterized in that:
in the step 2, the shape after semi-finishing is unilateral 0.3 mm-0.7 mm relative to the machining allowance reserved by the theoretical size.
In the step 3, the machining allowance left by the rough machined rod part cavity relative to the theoretical size is single-side 0.9 mm-1.1 mm, and the machining allowance left by the rough machined platform cavity relative to the theoretical size is single-side 0.8 mm-1.5 mm.
In the step 2 and the step 5, the equipment used for rough machining, semi-finish machining and finish machining of the appearance of the die blank is a numerical control lathe; in the step 3, the equipment used for rough machining of the rod part cavity is a drilling machine, and the equipment used for rough machining of the platform cavity is a numerical control machining center.
In the step 4, the quenching treatment is vacuum quenching treatment, the hardness value of the quenched die blank is HRC 55-HRC 58, the deformation of the quenched die blank is not more than 0.01mm, and the surface of the quenched die blank has no oxide skin.
In step 5, the planeness and the parallelism of the upper plane and the lower plane of the finish-machined mould are controlled within 0.02mm, and the verticality between the cylindrical surface and the bottom surface is controlled within 0.05 mm.
In the step 6, the rotating speed of the cutter for high-speed milling is 15000 rpm-20000 rpm.
In step 6, the concentricity of the rod part cavity after finish machining and the excircle of the die is controlled within 0.02mm, the dimensional precision of the die after finish machining in step 6 is up to 0.02mm, and the surface roughness is up to 1.6 microns.
In step 7, the electrode machining comprises rough discharge machining and low-gap fine discharge machining, the dimensional precision of the die after the low-gap fine discharge machining is required to reach 0.01mm, and the surface roughness is required to reach 1.6 microns.
The thickness of the nitriding layer in step 9 is 0.2 mm.
The invention has the beneficial effects that:
according to the processing method of the precision forging die for the tibial plateau artificial joint, the die blank is subjected to finish machining after being quenched and tempered, and the high-speed milling and the electrode machining are perfectly and organically combined during finish machining, so that the die machining precision and the surface quality of the rest parts except the joint tool mark of the high-speed milling and the electrode machining are effectively ensured, and the surface quality of the joint tool mark of the high-speed milling and the electrode machining is ensured through clamping, so that the integral machining precision and the surface quality of the die are effectively ensured to meet the design requirements; through quenching and nitriding treatment, the surface hardness and the wear resistance of the die can be greatly improved, the processing quality of the die is improved, and the service life of the die is prolonged; in addition, the method has simple process steps, can greatly improve the production efficiency and reduce the manufacturing cost of the die.
Drawings
FIG. 1 is a front view of a tibial plateau prosthetic joint;
FIG. 2 is a bottom view of FIG. 1;
FIG. 3 is a top view of the mold blank after step 3 of the present invention has been completed;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a top view of a tibial plateau prosthetic joint precision forging die machined in accordance with the present invention;
fig. 6 is a sectional view taken along line B-B of fig. 5.
Detailed Description
The invention relates to a processing method of a precision forging die of a tibial plateau artificial joint, which comprises the following steps:
step 1, blanking, namely taking a die steel round bar which is not subjected to quenching treatment, and blanking by adopting a sawing machine blanking mode to obtain a die blank;
2, performing rough machining and semi-finish machining on the appearance (including the bottom surface, the side surface and the top surface) of the die blank by using a numerically controlled lathe, wherein the machining allowance reserved for the theoretical size of the semi-finished appearance is 0.3-0.7 mm on one side, the flatness and the parallelism of the bottom surface and the top surface of the die blank are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 3, roughly processing a rod cavity 5 and a platform cavity 6 on the die blank; when the rod part cavity is machined, a center of a circle of the bottom surface of a mold blank is taken as an original point, a drilling machine is adopted to drill a center hole (namely the rod part cavity) in the bottom surface of the mold blank, and the size of the center hole is single-side 0.9 mm-1.1 m of machining allowance reserved relative to the theoretical size; when the platform cavity is machined, roughly machining the platform cavity by using a numerical control machining center with the center of the circle of the top surface of the die blank as an original point, wherein the machining allowance reserved by the roughly machined platform cavity relative to the theoretical size is 0.8 mm-1.5 mm on one side; the structure of the die blank is shown in fig. 3 and 4; in order to improve the consistency of multiple clamping in the process of processing the die, a step 8 with the depth of 5mm can be processed on the top surface of a die blank in advance, and for convenience of processing and calculation, the step is parallel to the U-shaped bottom surface of a platform cavity, so that the step can be used as an X-axis reference;
step 4, carrying out vacuum quenching treatment on the die blank, and detecting the hardness, size and surface quality of the die blank after vacuum quenching, wherein the hardness value of the die blank after quenching is HRC 55-HRC 58, the deformation of the die blank after quenching is not more than 0.01mm, and the surface of the die blank after quenching has no oxide skin; by adopting vacuum heat treatment, the heat treatment quality can be greatly improved, the deformation is small, and the effect of bright and clean surface is achieved;
step 5, performing finish machining on the appearance of the die blank by using a numerical control lathe, wherein the planeness and the parallelism of the top surface and the bottom surface of the die blank after finish machining are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 6, performing semi-finish machining and finish machining on the platform cavity and the rod part cavity by adopting high-speed milling, wherein the rotating speed of a cutter subjected to high-speed milling is 15000 rpm-20000 rpm; preferably, after finishing the platform cavity, finishing the rod part cavity; the machining tool of the platform cavity preferably adopts a phi 2mm hard alloy ball head cutter with high hardness, high oxidation resistance temperature and good wear resistance; the machining tool of the rod part cavity preferably adopts a phi 10mm lengthened hard alloy end mill which is high in hardness, high in oxidation resistance temperature and good in wear resistance, the lengthened hard alloy end mill adopts a multi-edge cutter, the length of a cutting edge is 40mm, the total length is 100mm, the cutter is suitable for high-speed machining, the rigidity is good, the cutter yield in side face cutting can be reduced to the maximum extent, a small-diameter avoiding section which is 20mm long can be additionally machined at one end, close to the cutting edge, of the rod part of the end mill, and interference can be effectively avoided; the hard alloy ball head cutter and the hard alloy end mill both have XCP coatings, so that the heat resistance and the wear resistance of the cutter can be improved; the concentricity of the rod part cavity after finish machining and the excircle of the die is controlled within 0.02mm, the dimensional precision of the die after finish machining reaches 0.02mm, and the surface roughness reaches 1.6 mu m;
step 7, performing finish machining on the wing part cavity 7 by adopting electrode machining, wherein the electrode machining comprises rough discharge machining and low-gap finish discharge machining, and the profiling precision of the wing part cavity can be further improved by replacing different electrodes to machine the same cavity; the electrode for low-gap fine discharge machining is made of red copper, and the red copper has good conductivity and small machining loss and can obtain higher precision; the discharge gap is 0.1mm, the size precision of the die after low-gap fine discharge machining is 0.01mm, and the surface roughness is 1.6 mu m; only slight tool contact marks exist at the joint of the electrode machining and the milling machining;
step 8, performing clamp repairing on the joint tool mark of the high-speed milling and electrode machining, wherein the clamp repairing adopts imported grinding paste, such as AKAY-8000 produced in America, and the joint tool reaches a mirror surface effect after the clamp repairing;
step 9, nitriding the whole die, wherein the thickness of the nitriding layer is 0.2 mm; the nitriding treatment adopts gas reinforced nitriding, so that the surface hardness of the die is enhanced and the wear resistance is improved on the premise of ensuring the precision of the die, and the die has good comprehensive mechanical properties and prolonged service life; the mold is finished, and the final mold structure is shown in fig. 5 and 6.
In the high-speed milling process, because the height of the die blank is higher and the whole die cavity needs to be finished, a powerful magnetic disk is preferably adopted to adsorb the die blank and then the die is processed. After the step 5 is finished, blowing off scrap iron, dust and the like on the bottom surface of the die blank, removing burrs, and wiping the bottom surface of the die blank clean before high-speed milling; wiping the powerful magnetic disc clean before clamping each time, and grinding the raised part of the table top of the powerful magnetic disc by using a oilstone; the mold blank is directly adsorbed on the table top of the powerful magnetic disk.
The technological parameters of the quenching, tempering, electrode processing and nitriding treatment are determined according to specific die steel materials, and the conventional process is adopted.
The method of manufacturing a finisher of the present invention will be described in detail with reference to several specific examples.
Example 1
The processing method of the precision forging die of the tibial plateau artificial joint comprises the following steps:
step 1, blanking, namely taking a die steel round bar which is not subjected to quenching treatment, and blanking by adopting a sawing machine blanking mode to obtain a die blank, wherein the size of the blank is as follows: phi 155mm 75 mm;
2, performing rough machining and semi-finish machining on the appearance of the die blank by using a numerical control lathe, wherein the machining allowance left for the theoretical size of the semi-finished appearance is unilateral 0.3mm, the planeness and parallelism of the bottom surface and the top surface of the die blank are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 3, roughly processing a rod part cavity and a platform cavity on the die blank; when the rod part cavity is machined, a center point of the bottom surface of the die blank is taken as an original point, a drilling machine is adopted to drill a central hole in the bottom surface of the die blank, and the size of the central hole is single-side 0.9mm relative to the machining allowance reserved by the theoretical size; when the platform cavity is machined, roughly machining the platform cavity by using a numerical control machining center with the center of the circle of the top surface of the die blank as an original point, wherein the machining allowance left by the roughly machined platform cavity relative to the theoretical size is unilateral 0.8 mm;
step 4, carrying out vacuum quenching treatment on the die blank, and detecting the hardness, size and surface quality of the die blank after vacuum quenching, wherein the hardness value of the die blank after quenching is HRC 55-HRC 58, the deformation of the die blank after quenching is not more than 0.01mm, and the surface of the die blank after quenching has no oxide skin;
step 5, performing finish machining on the appearance of the die blank by using a numerical control lathe, wherein the planeness and the parallelism of the top surface and the bottom surface of the die blank after finish machining are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 6, performing semi-finishing and finishing on the platform cavity and the rod part cavity in sequence by adopting high-speed milling, wherein the rotating speed of a cutter subjected to high-speed milling is 15000 rpm; the machining tool of the platform cavity adopts a phi 2mm hard alloy ball head cutter with high hardness, high oxidation resistance temperature and good wear resistance; the machining tool of the rod part cavity adopts a phi 10mm lengthened hard alloy end mill which is high in hardness, high in oxidation resistance temperature and good in wear resistance, the lengthened hard alloy end mill adopts a multi-edge cutter, the length of a cutting edge is 40mm, the total length is 100mm, and a small-diameter avoiding section which is 20mm long is additionally machined at one end, close to the cutting edge, of the rod part of the end mill; the hard alloy ball head cutter and the hard alloy end mill both have XCP coatings; the concentricity of the rod part cavity after finish machining and the excircle of the die is controlled within 0.02mm, the dimensional precision of the die after finish machining reaches 0.02mm, and the surface roughness reaches 1.6 mu m;
step 7, performing finish machining on the wing part cavity by adopting electrode machining, wherein the electrode machining comprises rough discharge machining and low-gap finish discharge machining; wherein, the electrode of the low-gap fine discharge machining is made of red copper, the discharge gap is 0.1mm, the dimensional precision of the die after the low-gap fine discharge machining is 0.01mm, and the surface roughness is 1.6 mu m; only slight tool contact marks exist at the joint of the electrode machining and the milling machining;
step 8, performing clamp repairing on the joint tool mark of the high-speed milling and electrode machining, wherein the clamp repairing adopts American AKAY-8000 grinding paste, and the joint tool reaches a mirror surface effect after the clamp repairing;
and 9, carrying out gas reinforced nitriding treatment on the whole die, wherein the thickness of the nitriding layer is 0.2 mm.
Example 2
The processing method of the precision forging die of the tibial plateau artificial joint comprises the following steps:
step 1, blanking, namely taking a die steel round bar which is not subjected to quenching treatment, and blanking by adopting a sawing machine blanking mode to obtain a die blank, wherein the size of the blank is as follows: phi 155mm 75 mm;
2, performing rough machining and semi-finish machining on the appearance of the die blank by using a numerical control lathe, wherein the machining allowance left for the theoretical size of the semi-finished appearance is unilateral 0.5mm, the planeness and parallelism of the bottom surface and the top surface of the die blank are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 3, roughly processing a rod part cavity and a platform cavity on the die blank; when the rod part cavity is machined, a center point of the bottom surface of the die blank is taken as an original point, a drilling machine is adopted to drill a central hole in the bottom surface of the die blank, and the size of the central hole is 1.0mm of machining allowance reserved relative to the theoretical size; when the platform cavity is machined, roughly machining the platform cavity by using a numerical control machining center with the center of the circle of the top surface of the die blank as an original point, wherein the machining allowance reserved by the roughly machined platform cavity relative to the theoretical size is unilateral 1.15 mm;
step 4, carrying out vacuum quenching treatment on the die blank, and detecting the hardness, size and surface quality of the die blank after vacuum quenching, wherein the hardness value of the die blank after quenching is HRC 55-HRC 58, the deformation of the die blank after quenching is not more than 0.01mm, and the surface of the die blank after quenching has no oxide skin;
step 5, performing finish machining on the appearance of the die blank by using a numerical control lathe, wherein the planeness and the parallelism of the top surface and the bottom surface of the die blank after finish machining are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 6, performing semi-finish machining and finish machining on the platform cavity and the rod part cavity in sequence by adopting high-speed milling, wherein the rotating speed of a cutter subjected to high-speed milling is 17500 rpm; the machining tool of the platform cavity adopts a phi 2mm hard alloy ball head cutter with high hardness, high oxidation resistance temperature and good wear resistance; the machining tool of the rod part cavity adopts a phi 10mm lengthened hard alloy end mill which is high in hardness, high in oxidation resistance temperature and good in wear resistance, the lengthened hard alloy end mill adopts a multi-edge cutter, the length of a cutting edge is 40mm, the total length is 100mm, and a small-diameter avoiding section which is 20mm long is additionally machined at one end, close to the cutting edge, of the rod part of the end mill; the hard alloy ball head cutter and the hard alloy end mill both have XCP coatings; the concentricity of the rod part cavity after finish machining and the excircle of the die is controlled within 0.02mm, the dimensional precision of the die after finish machining reaches 0.02mm, and the surface roughness reaches 1.6 mu m;
step 7, performing finish machining on the wing part cavity by adopting electrode machining, wherein the electrode machining comprises rough discharge machining and low-gap finish discharge machining; wherein, the electrode of the low-gap fine discharge machining is made of red copper, the discharge gap is 0.1mm, the dimensional precision of the die after the low-gap fine discharge machining is 0.01mm, and the surface roughness is 1.6 mu m; only slight tool contact marks exist at the joint of the electrode machining and the milling machining;
step 8, performing clamp repairing on the joint tool mark of the high-speed milling and electrode machining, wherein the clamp repairing adopts American AKAY-8000 grinding paste, and the joint tool reaches a mirror surface effect after the clamp repairing;
and 9, carrying out gas reinforced nitriding treatment on the whole die, wherein the thickness of the nitriding layer is 0.2 mm.
Example 3
The processing method of the precision forging die of the tibial plateau artificial joint comprises the following steps:
step 1, blanking, namely taking a die steel round bar which is not subjected to quenching treatment, and blanking by adopting a sawing machine blanking mode to obtain a die blank, wherein the size of the blank is as follows: phi 155mm 75 mm;
2, performing rough machining and semi-finish machining on the appearance of the die blank by using a numerical control lathe, wherein the machining allowance left for the theoretical size of the semi-finished appearance is unilateral 0.7mm, the planeness and parallelism of the bottom surface and the top surface of the die blank are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 3, roughly processing a rod part cavity and a platform cavity on the die blank; when the rod part cavity is machined, a center of a circle of the bottom surface of the die blank is taken as an original point, a drilling machine is adopted to drill a central hole in the bottom surface of the die blank, and the size of the central hole is 1.1mm of machining allowance reserved relative to the theoretical size; when the platform cavity is machined, roughly machining the platform cavity by using a numerical control machining center with the center of the circle of the top surface of the die blank as an original point, wherein the machining allowance reserved by the roughly machined platform cavity relative to the theoretical size is unilateral 1.5 mm;
step 4, carrying out vacuum quenching treatment on the die blank, and detecting the hardness, size and surface quality of the die blank after vacuum quenching, wherein the hardness value of the die blank after quenching is HRC 55-HRC 58, the deformation of the die blank after quenching is not more than 0.01mm, and the surface of the die blank after quenching has no oxide skin;
step 5, performing finish machining on the appearance of the die blank by using a numerical control lathe, wherein the planeness and the parallelism of the top surface and the bottom surface of the die blank after finish machining are controlled within 0.02mm, and the verticality of the side surface and the bottom surface is controlled within 0.05 mm;
step 6, performing semi-finishing and finishing on the platform cavity and the rod part cavity in sequence by adopting high-speed milling, wherein the rotating speed of a cutter subjected to high-speed milling is 20000 rpm; the machining tool of the platform cavity adopts a phi 2mm hard alloy ball head cutter with high hardness, high oxidation resistance temperature and good wear resistance; the machining tool of the rod part cavity adopts a phi 10mm lengthened hard alloy end mill which is high in hardness, high in oxidation resistance temperature and good in wear resistance, the lengthened hard alloy end mill adopts a multi-edge cutter, the length of a cutting edge is 40mm, the total length is 100mm, and a small-diameter avoiding section which is 20mm long is additionally machined at one end, close to the cutting edge, of the rod part of the end mill; the hard alloy ball head cutter and the hard alloy end mill both have XCP coatings; the concentricity of the rod part cavity after finish machining and the excircle of the die is controlled within 0.02mm, the dimensional precision of the die after finish machining reaches 0.02mm, and the surface roughness reaches 1.6 mu m;
step 7, performing finish machining on the wing part cavity by adopting electrode machining, wherein the electrode machining comprises rough discharge machining and low-gap finish discharge machining; wherein, the electrode of the low-gap fine discharge machining is made of red copper, the discharge gap is 0.1mm, the dimensional precision of the die after the low-gap fine discharge machining is 0.01mm, and the surface roughness is 1.6 mu m; only slight tool contact marks exist at the joint of the electrode machining and the milling machining;
step 8, performing clamp repairing on the joint tool mark of the high-speed milling and electrode machining, wherein the clamp repairing adopts American AKAY-8000 grinding paste, and the joint tool reaches a mirror surface effect after the clamp repairing;
and 9, carrying out gas reinforced nitriding treatment on the whole die, wherein the thickness of the nitriding layer is 0.2 mm.

Claims (4)

1. A processing method of a precision forging die of a tibial plateau artificial joint is characterized in that: which comprises the following steps:
step 1, blanking, namely blanking a round steel bar of a die to obtain a die blank;
step 2, performing rough machining and semi-finish machining on the appearance of the die blank, reserving machining allowance of a single side of 0.3-0.7 mm relative to the theoretical size of the semi-finished appearance, controlling the flatness and parallelism of the bottom surface and the top surface of the die blank within 0.02mm, and controlling the perpendicularity of the side surface and the bottom surface within 0.05 mm;
step 3, roughly machining a rod part cavity and a platform cavity on the die blank, and drilling a central hole in the bottom surface of the die blank to form the rod part cavity by taking the circle center of the bottom surface of the die blank as an original point when the rod part cavity is machined, wherein the size of the central hole is 0.9 mm-1.1 m of machining allowance reserved relative to the theoretical size; when the platform cavity is machined, machining the platform cavity by taking the circle center of the top surface of the die blank as an original point, wherein the machining allowance reserved by the rough machined platform cavity relative to the theoretical size is 0.8 mm-1.5 mm on one side; processing a step on the top surface of the die blank, wherein the step is parallel to the U-shaped bottom surface of the platform cavity and is used as an X-axis reference;
step 4, carrying out vacuum quenching treatment on the die blank, detecting the hardness, the size and the surface quality of the quenched die blank, and judging whether the hardness, the size and the surface quality meet the requirements: the hardness value of the quenched die blank is HRC 55-HRC 58, the deformation of the quenched die blank is not more than 0.01mm, and the surface of the quenched die blank has no oxide skin;
step 5, performing finish machining on the appearance of the mold blank, wherein the planeness and the parallelism of the upper plane and the lower plane of the finish machined mold are controlled within 0.02mm, and the verticality of the cylindrical surface and the bottom surface is controlled within 0.05 mm;
step 6, performing semi-finishing and finishing on the platform cavity and the rod part cavity by adopting high-speed milling, wherein the concentricity of the rod part cavity after finishing and the excircle of the mold is controlled within the range of 0.02mm, the dimensional precision of the mold is required to reach 0.02mm, and the surface roughness is required to reach 1.6 mu m;
step 7, performing finish machining on the wing part cavity by adopting electrode machining, wherein the electrode machining comprises rough discharge machining and low-gap fine discharge machining, the dimensional precision of the die after the low-gap fine discharge machining is up to 0.01mm, and the surface roughness is up to 1.6 microns;
step 8, performing clamp repairing on tool joint marks of high-speed milling and electrode machining;
and 9, nitriding the whole die to complete the machining of the die.
2. The method for processing the precision forging die of the tibial plateau artificial joint according to claim 1, wherein the method comprises the following steps: in the step 2 and the step 5, the equipment used for rough machining, semi-finish machining and finish machining of the appearance of the die blank is a numerical control lathe; in the step 3, the equipment used for rough machining of the rod part cavity is a drilling machine, and the equipment used for rough machining of the platform cavity is a numerical control machining center.
3. The method for processing the precision forging die of the tibial plateau artificial joint according to claim 1, wherein the method comprises the following steps: in the step 6, the rotating speed of the cutter for high-speed milling is 15000 rpm-20000 rpm.
4. The method for processing the precision forging die of the tibial plateau artificial joint according to claim 1, wherein the method comprises the following steps: the thickness of the nitriding layer in step 9 is 0.2 mm.
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CN113369833B (en) * 2021-06-28 2023-04-21 宁波江丰复合材料科技有限公司 Processing method of hot-pressing die
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