CN112475822B - Surface composite treatment method for root part of mold core of extrusion mold - Google Patents
Surface composite treatment method for root part of mold core of extrusion mold Download PDFInfo
- Publication number
- CN112475822B CN112475822B CN202011248780.3A CN202011248780A CN112475822B CN 112475822 B CN112475822 B CN 112475822B CN 202011248780 A CN202011248780 A CN 202011248780A CN 112475822 B CN112475822 B CN 112475822B
- Authority
- CN
- China
- Prior art keywords
- root
- core
- die
- nitriding
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011282 treatment Methods 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 10
- 238000005121 nitriding Methods 0.000 claims abstract description 57
- 238000010791 quenching Methods 0.000 claims abstract description 55
- 230000000171 quenching effect Effects 0.000 claims abstract description 55
- 238000005422 blasting Methods 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 24
- 230000008595 infiltration Effects 0.000 claims abstract description 7
- 238000001764 infiltration Methods 0.000 claims abstract description 7
- 230000006698 induction Effects 0.000 claims description 27
- 238000005498 polishing Methods 0.000 claims description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000005480 shot peening Methods 0.000 claims 1
- 238000005728 strengthening Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 18
- 230000035882 stress Effects 0.000 description 15
- 230000009286 beneficial effect Effects 0.000 description 12
- 239000007789 gas Substances 0.000 description 7
- 230000002035 prolonged effect Effects 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/10—Making tools by operations not covered by a single other subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
Abstract
The invention relates to a surface composite treatment method for the root part of a mold core of an extrusion mold, which comprises the following steps: zone quenching, namely carrying out zone quenching on the root of the core and the rest zones except the root of the core; shot blasting is carried out on the region, and shot blasting is carried out on the extrusion die, wherein the shot blasting time of the root of the core is 1-5 times of that of the rest region; and (4) nitriding the region, coating an anti-seepage coating or an accelerating infiltration coating on the root part of the mold core, and then nitriding the extrusion mold. The invention adopts different treatment processes for different parts of the extrusion die, and performs strengthening treatment on the root part of the core, which is different from other regions, so that the toughness and the surface pressure stress of the root part of the core are improved, and the generation of micro cracks or fatigue cracks caused by surface nitriding embrittlement under the action of circulating stress is reduced, thereby reducing the probability of scrapping of the die due to fracture of a shunting bridge, ensuring the surface hardness of the die except the root part of the core, and prolonging the service life of the die by 30-300%.
Description
Technical Field
The invention relates to a surface composite treatment method for the root part of a mold core of an extrusion mold, belonging to the technical field of metal material surface strengthening treatment methods.
Background
Because the extrusion die bears the severe working environment of high temperature, high pressure and high friction for a long time, the common die steel surface treatment process cannot meet the use requirement. In the shunting mold, the integral nitriding heat treatment of the mold can improve the surface hardness of the mold, but fatigue cracks are easily generated in the root area of the mold core at the bottom of the shunting bridge under the repeated cyclic action of extrusion force, so that the mold is cracked and scrapped early.
At present, the treatment modes of the metal surface are mostly divided into four types: surface mechanical treatment, surface chemical treatment, surface electrochemical treatment and surface modern treatment. Most of the treatments for the extrusion die are nitriding and shot blasting, but most of them are only to increase the surface hardness of the material and are less considered for toughness. The flat split die and the tongue-shaped combined die for extrusion are subjected to repeated extrusion force for a long time, and although the wear of the die can be reduced by improving the hardness of the die, brittle cracks on the surface of the die are easy to generate, and the die is easy to crack and scrap in an early stage. At present, in a plane split flow die, the die scrapped due to the cracking of the root part of a core accounts for more than 70% of all scrapped dies, so that the cost of the die accounts for up to 30% of the whole aluminum profile extrusion production. At present, enterprises have no good method for solving the problem.
In the prior art, in chinese patent CN201711127249.9, although the invention improves the toughness and hardness of the surface of the material, the method is not suitable for die steel, but only for nonferrous metals, and does not perform differential surface treatment on the root of the core of the aluminum alloy extrusion die and the magnesium alloy tongue-shaped combined die. In the chinese patent CN201811165906.3, the toughness and hardness of the mold surface are improved by soft nitriding, but the load that the nitrided layer of soft nitriding can bear is generally low, and the hardness after soft nitriding is liable to not meet the specific requirement, and the mold deformation is large. The differentiated surface treatment is not carried out on the root part of the aluminum alloy extrusion die core, and the improvement on the crack resistance of the root part of the shunt bridge is not great.
Disclosure of Invention
The invention provides a surface compound treatment method for the root of a mold core of an extrusion mold, aiming at the problem that the service life of the mold is influenced by the cracking of the root of the mold core of a plane split flow mold and a tongue-shaped combined mold in the prior art.
The technical scheme for solving the technical problems is as follows: a surface composite treatment method for the root part of a core of an extrusion die comprises the following steps:
zone quenching, namely carrying out zone quenching on the root of the core and the rest zones except the root of the core;
shot blasting is carried out on the region, and shot blasting is carried out on the extrusion die, wherein the shot blasting time of the root of the core is 1-5 times of that of the rest region;
and (4) nitriding the region, coating an anti-seepage coating or an accelerating infiltration coating on the root part of the mold core, and then nitriding the extrusion mold.
The invention has the beneficial effects that: according to the invention, through carrying out zone quenching, zone shot blasting and zone nitriding on the die, the integral surface hardness of the die is ensured, the toughness and surface compressive stress of the root part of the core are improved, and the probability of die fracture and scrap caused by micro cracks or fatigue cracks due to surface nitriding embrittlement under the action of cyclic stress is reduced, so that the service life of the die can be prolonged by 30-300%.
On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:
further, the nitriding treatment is gas nitriding and/or ion nitriding.
The beneficial effect of adopting the further technical scheme is that: according to different stress levels of the surface of the die, different nitriding modes are adopted, so that the fatigue life of the die is prolonged.
Further, the region is nitrided, ion nitriding is carried out on the root part of the core, and gas nitriding is carried out on the rest region.
The beneficial effect of adopting the further technical scheme is that: according to different toughness requirements, different nitriding modes are adopted, so that the service life of the root part of the mold core is prolonged, and the cost is saved.
Further, the gas nitriding comprises the following two stages: in the first stage, the temperature is 500-525 ℃, and the decomposition rate of ammonia is 38-40%; in the second stage, the temperature is 530-550 ℃, and the decomposition rate of ammonia is 60-65%.
The beneficial effect of adopting the further technical scheme is that: the nitriding treatment can obtain a permeation layer without a white bright layer or with a small number of white bright layers, and the permeation layer has good toughness, high hardness and is not easy to crack.
Further, the region is further polished after being shot-blasted.
The beneficial effect of adopting the further technical scheme is that: the polishing can remove the microscopic defects on the surface of the part, reduce the surface roughness and facilitate uniform nitriding.
Further, rough machining, heat treatment and/or finish machining are included.
The beneficial effect of adopting the further technical scheme is that: through carrying out optimization combination to multiple surface treatment modes, the beneficial effects of the composite material are far greater than that of simple superposition, and the service life of the die is prolonged.
Furthermore, the shot blasting adopts cast iron shots, ceramic shots or glass beads with the diameter of 0.2mm-3 mm.
The beneficial effect of adopting the further technical scheme is that: the shot blasting is carried out on the root part of the mold core, so that the surface of the root part of the mold core can obtain larger compressive stress, and when the external stress is borne, a part of the compressive stress can be released to offset the tensile stress, so that the service life of the mold is prolonged.
Further, the extrusion die is a planar split die upper die or a tongue-shaped die bridge, axial pressure is applied to the central area of the inlet face of the extrusion die upper die or the tongue-shaped die bridge, and then shot blasting is carried out.
The beneficial effect of adopting the further technical scheme is that: applying an axial pre-stress prior to peening can increase the effect of peening, resulting in higher compressive stress at the core root.
Further, the zone quenching comprises zone laser quenching and/or zone induction quenching, wherein the zone laser quenching is laser quenching which adopts different powers for the root of the core and other zones except the root of the core; the zone induction quenching is to perform induction quenching on the root zone of the core.
The beneficial effect of adopting the further technical scheme is that: different quenching treatment processes are adopted for different parts of the die, and particularly, the root of the core is subjected to strengthening treatment which is different from other areas except the root of the core, so that the toughness and the surface compressive stress of the root of the core can be obviously improved.
Further, the zone induction quenching comprises high-frequency induction quenching, medium-frequency induction quenching, power-frequency induction quenching or a combination of the three induction quenching.
The beneficial effect of adopting the further technical scheme is that: the induction quenching treatment is carried out on the root of the mold core, so that the strength and toughness of the deep layer of the root of the mold core can be improved, and the surface compressive stress is further improved.
Drawings
FIG. 1 is a flow chart of example 1 of the present application;
FIG. 2 is a flow chart of example 2 of the present application;
FIG. 3 is a flowchart of example 3 of the present application;
FIG. 4 is a flowchart of example 4 of the present application;
FIG. 5 is a schematic structural view of an upper die of the planar flow-splitting die;
FIG. 6 is a cross-sectional view of an upper die of the planar splitter die;
FIG. 7 is a front view of the tongue type split mold;
FIG. 8 is a left side view of the tongue type split mold;
FIG. 9 is a top view of a segmented tongue die;
fig. 10 is a flowchart of processing a planar shunting die according to the present application.
The reference numbers are recorded as follows: the mold core comprises a mold core 1, a working tape 2, a diversion hole 3, a mold core root A4, a bridge bottom 5, a pier 6, a working tape B7, a mold core root B8, a combination needle 9, a mold outer sleeve 10, a mold bridge 11, a support column 12 and a mold inner sleeve 13.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The application range of the invention includes but is not limited to aluminum profile extrusion die, magnesium alloy extrusion die, zinc alloy extrusion die, and can also be applied to shunt extrusion die of all nonferrous metals and alloy profiles thereof. The application range of the invention is not limited to the split die, but also can be applied to other extrusion dies which need to bear cyclic stress, such as: tongue-type assembling dies, and the like.
The following embodiment is described by taking a plane split-flow die upper die and a tongue-shaped combined die as an example, wherein the split-flow die upper die comprises split-flow holes 3, split-flow bridges, a core 1 and a working tape 2 with reference to fig. 5 and 6, the core 1 is provided with the working tape 2, the split-flow die is provided with a plurality of split-flow holes 3, the split-flow bridges connected with the core 1 are arranged between the adjacent split-flow holes 3, the bottom of each split-flow bridge is a bridge bottom 5, the joint of the bridge bottom 5 and the core 1 forms a core root A4, and the bridge bottom 5 is connected with a pier 6. The root of the core 1 is a spherical area which surrounds the center of the root of the core and has the diameter occupying 1/30-1/6 of the die.
The tongue-shaped combined die comprises a die outer sleeve 10, a die inner sleeve 13, a support column 12, a combined needle 9 and a die bridge 11 which are integrally manufactured, wherein the combined needle 9 is arranged below the support column 12, a core root part B8 is formed at the joint of the combined needle 9 and the support column 12, and a working tape B7 is arranged on the outer side of the core root part B8.
In the working process, the core root A4 of the upper die of the plane diversion die and the core root B8 of the tongue-shaped combined die are subjected to repeated extrusion force, so that cracking and scrapping are easy to occur.
Example 1:
as shown in fig. 1, 5 to 9, a surface compound treatment method of a core root of an extrusion die performs the following steps:
the method comprises the following steps of zone quenching, wherein the zone quenching comprises zone laser quenching and zone induction quenching, and the zone laser quenching is to adopt laser quenching with different powers on the root part of a core and the rest zones; the laser quenching power adopted for the root of the core is 1.5KW, and the laser quenching power adopted for the rest areas is 1.3 KW. The power of the root of the core is selected mainly to ensure the surface toughness and strength and assisted by improving the hardness. The power of other areas is selected mainly to improve the hardness; the core root includes core root a4 and core root B8.
Before regional shot blasting, applying axial pressure of 50MPa-650MPa to the central region of the inlet surface of the upper die of the plane split-flow die or a die bridge of the tongue-shaped die to generate tensile stress at the root of the die core, then carrying out shot blasting on the upper die of the plane split-flow die and the tongue-shaped combined die, wherein the shot blasting adopts cast iron shots, ceramic shots or glass beads with the diameter of 0.2mm-3mm, and the shot blasting time of the root of the die cores of the two dies is 1-5 times that of the rest regions; the rest areas are a working zone, a shunting hole wall, a shunting bridge, a mold core and the like;
and polishing, namely polishing the root part and the surface of the rest area of the core of the mold, wherein the polishing can adopt a traditional mechanical polishing method, a laser polishing method or a combination of the two methods. For example, the mechanical polishing is carried out for semi-fine polishing, then the laser polishing is carried out for ultra-fine polishing, and the roughness of the extrusion die is less than 0.2um after polishing, so that the surface roughness is reduced, and nitriding is facilitated;
nitriding the area, coating an anti-seepage coating or an infiltration accelerating coating on the root part of the mold core, and then nitriding the extrusion mold; in the nitriding treatment, if the surface nitrogen content is too high, a white bright layer is formed on the surface, and the white bright layer is hard and brittle, and is not suitable for a surface subjected to stress variation, and is easily broken. On the other hand, if the nitrogen content of the surface is low, the surface hardness will not meet the requirement. Therefore, the surface layer without the white layer and with the thicker nitriding layer thickness should be controlled to improve the usability and the life of the mold. Therefore, nitriding of the root part of the mold core is different from nitriding of other areas, and an anti-seepage coating or an infiltration promoting coating is reasonably adopted according to the stress condition of the root part of the mold core of an actual mold.
Nitriding can be carried out using the following three schemes, scheme 1: according to different conditions, gas nitriding is carried out after anti-seepage or catalytic infiltration coating is coated on the root part and the surrounding area of the mold core so as to improve the thickness and the performance of a nitriding layer in the root part area of the mold core, and then normal gas nitriding treatment is carried out on the rest areas except the root part of the mold core. The impervious coating is coated on the surface of the root part of the mold core, two layers of coating are carried out, the thickness of each layer is about 0.4mm, the surface leakage is ensured, and then the mold core is dried at 60 ℃.
The gas nitriding comprises the following two stages: the temperature is controlled to be 500-525 ℃ in the first stage, the decomposition rate of the ammonia controlled by the flow of the ammonia is controlled to be 38-40%, the temperature is controlled to be 530-550 ℃ in the second stage, and the decomposition rate of the ammonia controlled by the flow of the ammonia is controlled to be 60-65%. The nitriding treatment can obtain a permeation layer without a white bright layer or with a small number of white bright layers, and the permeation layer has good toughness, high hardness and is not easy to crack. The anti-seepage or catalytic infiltration coating after nitriding treatment is powdered, and the residue is cleaned by a steel wire brush.
Scheme 2: coating an anti-seepage or catalytic permeation coating on the root part and the surrounding area of the mold core, then carrying out ion nitriding to improve the thickness and the performance of a nitriding layer in the root part area of the mold core, and then carrying out normal ion nitriding treatment on the rest areas except the root part of the mold core.
Scheme 3: ion nitriding is performed after coating an anti-seepage or catalytic coating on the root part and the surrounding area of the core, and then gas nitriding is performed on the rest areas except the root part of the core.
And carrying out induction quenching on the root area of the core. The quenching mode is high-frequency induction quenching, medium-frequency induction quenching or power-frequency induction quenching or the combination of the three induction quenching modes, and different quenching modes are adopted according to different requirements, so that the strength and the toughness of the root of the mold core are better improved.
The root of the mold core can also be subjected to laser quenching or zone induction quenching, the strength and toughness of the root of the mold core can also be improved, and the specific operation mode is the same as that described above and is not repeated.
zone shot blasting, polishing, zone nitriding, zone laser quenching and zone induction quenching.
zone induction quenching, zone shot blasting, polishing, zone nitriding and zone laser quenching.
zone shot blasting, polishing, zone induction quenching, zone nitriding and zone laser quenching.
The surface composite treatment method of the present invention does not limit the treatment sequence of each step, and a suitable treatment sequence can be selected according to the field situation, and the rest of embodiments 2 to 4 are the same as embodiment 1, and are not described herein again.
Referring to fig. 10, the surface composite treatment method of the present application is combined with methods such as rough machining heat treatment, taking a planar split-flow die upper die as an example, the planar split-flow die mainly comprises an upper die and a lower die which are used in cooperation, the lower die is directly processed by the existing lower die processing procedure, the upper die is subjected to rough machining and heat treatment such as quenching and tempering, then the regional laser quenching and the regional shot blasting are performed according to the method of the present application, then the upper die and the lower die are assembled and then subjected to die testing, the upper die and the lower die are repaired according to the die testing condition until the die testing meets the requirements, then the upper die is subjected to polishing treatment to reduce the surface roughness so as to facilitate uniform nitriding, after polishing, the regional nitriding and the regional induction quenching are performed according to the present invention, and after the product is qualified, the delivery is completed. According to the invention, through optimized combination of multiple surface treatment modes, the beneficial effects of the method are far greater than the effect of simple superposition, the probability of mould scrap caused by cracks generated by surface nitriding quenching of the shunting mould under the action of cyclic stress is reduced, and the service life of the mould is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A surface composite treatment method for a core root of an extrusion die is characterized by comprising the following steps:
the method comprises the following steps of performing zone quenching, namely performing zone quenching on the root of a mold core and other zones except the root of the mold core, wherein the zone quenching comprises zone laser quenching and/or zone induction quenching, the zone laser quenching is the laser quenching which adopts different powers for the root of the mold core and the other zones except the root of the mold core, the laser quenching power adopted for the root of the mold core is 1.5KW, the laser quenching power adopted for the other zones is 1.3KW, and the root of the mold core is a spherical zone which surrounds the center diameter of the root of the mold core and accounts for 1/30-1/6 of the diameter of a mold;
shot blasting is carried out on the region, shot blasting is carried out on the extrusion die, wherein the shot blasting time of the root of the core is 5 times that of the rest region;
the method comprises the following steps of carrying out regional nitriding, coating anti-seepage or catalytic infiltration coating on the root part and the peripheral region of a mold core, then carrying out gas nitriding, carrying out normal gas nitriding treatment on the rest regions except the root part of the mold core, coating the anti-seepage coating on the surface of the root part of the mold core, carrying out two-layer coating, wherein the thickness of each layer is 0.4mm, and then carrying out air drying at the temperature of 60 ℃, wherein the regional nitriding comprises gas nitriding and/or ion nitriding, and the gas nitriding comprises the following two stages: in the first stage, the temperature is 500-525 ℃, and the decomposition rate of ammonia is 38-40%; in the second stage, the temperature is 530-550 ℃, and the decomposition rate of ammonia is 60-65%.
2. The method of claim 1 wherein the area nitriding includes ion nitriding the core root and gas nitriding the remaining area.
3. The method of claim 1, further comprising polishing the region after the shot peening.
4. The method for surface compound treatment of the core root of an extrusion die of claim 1, further comprising rough machining, heat treatment and/or finish machining.
5. The surface composite treatment method for the core root of the extrusion die as set forth in claim 1, wherein the shot blasting employs cast iron shots, ceramic shots or glass beads having a diameter of 0.2mm to 3 mm.
6. The method for surface-compounding the root portion of the core of an extrusion die as set forth in claim 1, wherein the extrusion die is a flat split die upper die or a tongue die bridge, and shot blasting is performed by applying an axial pressure to a central region of an inlet face of the upper die or the tongue die bridge of the extrusion die.
7. The method of claim 1, wherein the zone induction hardening is induction hardening of the core root zone.
8. The method for compositely treating the surface of the root part of the core of the extrusion die as claimed in claim 7, wherein the zone induction hardening comprises high frequency induction hardening, medium frequency induction hardening, power frequency induction hardening or a combination of the three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248780.3A CN112475822B (en) | 2020-11-10 | 2020-11-10 | Surface composite treatment method for root part of mold core of extrusion mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248780.3A CN112475822B (en) | 2020-11-10 | 2020-11-10 | Surface composite treatment method for root part of mold core of extrusion mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112475822A CN112475822A (en) | 2021-03-12 |
| CN112475822B true CN112475822B (en) | 2022-05-06 |
Family
ID=74929297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011248780.3A Active CN112475822B (en) | 2020-11-10 | 2020-11-10 | Surface composite treatment method for root part of mold core of extrusion mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112475822B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113696103B (en) * | 2021-08-18 | 2023-03-21 | 武汉钢铁有限公司 | Long-service-life steel rail treatment method |
| CN115058681A (en) * | 2022-06-28 | 2022-09-16 | 江苏华东三和兴模具材料有限公司 | Nitriding production process for prolonging service life of die-casting die |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030027301A (en) * | 2001-09-28 | 2003-04-07 | 에이원메디칼(주) | The method of exactness casting for medical forceps |
| CN1252290C (en) * | 2002-07-22 | 2006-04-19 | 广州富通光科技术有限公司 | Laser surface hardening process of gear |
| CN101215680A (en) * | 2008-01-08 | 2008-07-09 | 上海大学 | Aluminum alloy die-casting die steel surface shot blasting strengthening treatment method |
| CN103602797B (en) * | 2013-10-29 | 2016-01-20 | 山东开泰抛丸机械股份有限公司 | High rigidity steel wire cut pill thermal treatment process |
| CN103643243B (en) * | 2013-12-11 | 2016-04-06 | 江苏大学 | A kind of metallic substance high highly malleablized surface modifying method |
| WO2016027207A1 (en) * | 2014-08-18 | 2016-02-25 | Bharat Forge Limited | A method of hardening die surfaces |
| CN104762587B (en) * | 2015-03-05 | 2017-12-26 | 江苏龙城精锻有限公司 | Die corner nitriding process method |
| CN109652757A (en) * | 2018-12-28 | 2019-04-19 | 宁波合力模具科技股份有限公司 | A kind of high vacuum squeezes the surface recombination processing method of compression mod |
| CN110405430A (en) * | 2019-08-29 | 2019-11-05 | 汉德车桥(株洲)齿轮有限公司 | A kind of active conical gear Thread Machining Process |
-
2020
- 2020-11-10 CN CN202011248780.3A patent/CN112475822B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112475822A (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107201524B (en) | Laser strengthening processing forming method for surface of rotary wheel | |
| CN112475822B (en) | Surface composite treatment method for root part of mold core of extrusion mold | |
| CN111690794B (en) | Preparation method of engineering machinery final transmission gear | |
| CN111485070B (en) | Preparation process of antifriction and wear-resistant gear part | |
| JP2009072798A (en) | Die | |
| CN109880977A (en) | A method of improving H13 steel gear Service Life of Hot Forging Die | |
| CN109652757A (en) | A kind of high vacuum squeezes the surface recombination processing method of compression mod | |
| CN110468259B (en) | Preparation method of wear-resistant hydraulic pump part | |
| CN110616401A (en) | Preparation method of wear-resistant hydraulic pump part | |
| CN111102185A (en) | Bimetallic cylinder body, friction pair and processing method for axial variable plunger pump | |
| CN110629170B (en) | Method for improving wear resistance of high-pressure hydraulic pump part | |
| CN104942537A (en) | Manufacturing method for circular rail | |
| CN104895638B (en) | A kind of inlet valve of automobile engine | |
| JPH06182409A (en) | Combined sleeve roll and its production | |
| CN101363123A (en) | Composite technique of steel member surface shot-blasting and plasma low-temperature boriding | |
| CN104455538A (en) | Ball valve ball with high-wearable sealing surface and production method thereof | |
| CN210030919U (en) | Surface coating of die-casting die and die-casting die | |
| CN113564608A (en) | Method for integral hardening treatment of integral piston of diesel engine | |
| KR102192892B1 (en) | heat treatment and Surface propagation method of Metalwork | |
| CN107937666A (en) | A kind of processing method for lifting mould steel and using quality | |
| CN216306046U (en) | High-temperature-resistant and wear-resistant valve seat ring | |
| CN110834075A (en) | Machining process of engine cylinder body cavity die | |
| JP3846811B2 (en) | Piston for internal combustion engine | |
| CN110977625B (en) | Method for improving wear resistance of conical surface of valve disc and reducing surface roughness | |
| CN109262203A (en) | A kind of preparation method of impact resistance alloy tool steel steel ball |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20210312 Assignee: Zoucheng Juli Machinery Co.,Ltd. Assignor: Yantai University Contract record no.: X2023980046861 Denomination of invention: A Surface Composite Treatment Method for the Core Root of an Extrusion Mold Granted publication date: 20220506 License type: Common License Record date: 20231120 Application publication date: 20210312 Assignee: SHANDONG ZHENGFANG INTELLIGENT ROBOT INDUSTRY DEVELOPMENT Co.,Ltd. Assignor: Yantai University Contract record no.: X2023980046857 Denomination of invention: A Surface Composite Treatment Method for the Core Root of an Extrusion Mold Granted publication date: 20220506 License type: Common License Record date: 20231120 Application publication date: 20210312 Assignee: Shandong Mencius ecological agriculture Limited by Share Ltd. Assignor: Yantai University Contract record no.: X2023980046853 Denomination of invention: A Surface Composite Treatment Method for the Core Root of an Extrusion Mold Granted publication date: 20220506 License type: Common License Record date: 20231120 Application publication date: 20210312 Assignee: JINING LUWEI HYDRAULIC TECHNOLOGY CO.,LTD. Assignor: Yantai University Contract record no.: X2023980046851 Denomination of invention: A Surface Composite Treatment Method for the Core Root of an Extrusion Mold Granted publication date: 20220506 License type: Common License Record date: 20231120 |
|
| EE01 | Entry into force of recordation of patent licensing contract |