CN116463483A - Shot peening strengthening method for die casting die surface - Google Patents
Shot peening strengthening method for die casting die surface Download PDFInfo
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- CN116463483A CN116463483A CN202310318635.5A CN202310318635A CN116463483A CN 116463483 A CN116463483 A CN 116463483A CN 202310318635 A CN202310318635 A CN 202310318635A CN 116463483 A CN116463483 A CN 116463483A
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- 238000004512 die casting Methods 0.000 title claims abstract description 102
- 238000005480 shot peening Methods 0.000 title claims abstract description 61
- 238000005728 strengthening Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005121 nitriding Methods 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 7
- 230000035515 penetration Effects 0.000 claims abstract description 4
- 238000005422 blasting Methods 0.000 claims description 30
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 150000004767 nitrides Chemical class 0.000 abstract description 3
- 208000025599 Heat Stress disease Diseases 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 40
- 239000008188 pellet Substances 0.000 description 12
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention provides a shot peening strengthening method for the surface of a die casting die, which comprises the following steps: step 1), carrying out surface nitriding treatment on a die-casting die needing shot peening strengthening treatment, and forming a nitrogen atom penetration layer and a nitriding white layer on the surface of the die-casting die, wherein the hardness of the nitriding white layer is greater than that of the surface of the die-casting die; step 2), performing preliminary shot peening strengthening treatment on the surface of the die casting mold by using a first shot peening medium with a first particle size and a first hardness; step 3), performing secondary shot peening strengthening treatment on the surface of the die casting mold by using a second shot peening medium with a second particle size and a second hardness; the first hardness is greater than the hardness of the surface of the die casting mold, the second hardness is greater than the hardness of the nitride white layer, and the second grain size is smaller than the first grain size. The heat-fatigue resistance and the high temperature resistance of the surface of the die casting mold treated by the method are obviously improved, the nitriding white layer of the surface of the die casting mold is thoroughly removed, and the surface of the die casting mold has better glossiness.
Description
Technical Field
The invention relates to the technical field of strengthening treatment of the surface of a die material, in particular to a shot peening strengthening method of the surface of a die casting die.
Background
With the development of modern industrial technology, the demand for mold materials is increasing, and higher requirements are also put on the use performance. The mechanical property of the die is improved, the service life of the die is prolonged, and considerable social and economic benefits are brought to human society.
The surface treatment technology is adopted to strengthen the surface of the die from the viewpoints of saving energy, fully playing the performance potential of the material, obtaining special performance and maximum technical and economic benefits, and is an effective main means for improving the service performance and service life of the die. The surface treatment technique is to change the surface morphology, chemical composition, phase composition, microstructure, defect state or stress state of a material by applying various coatings or adopting mechanical, physical, chemical and other methods, thereby improving the overall service performance of the material. Shot peening is one of the economical, simple and effective techniques for treating the surface of a mold. Shot peening is the high-speed, continuous peening of a metal surface with the aid of hard shot, which produces intense cold work hardening. The stress state, microhardness and surface layer microscopic morphology of the metal surface can be obviously changed through shot blasting, so that the fatigue strength, impact abrasion resistance and stress corrosion resistance of the surface of the die material are improved; shot peening can also change the surface roughness of the mold.
In order to improve the mechanical property of the die to a greater extent, the surface of the die may be subjected to nitriding treatment before shot peening strengthening treatment. The surface nitridation of the die refers to that the die is placed in a nitrogen-filled environment with nitrogen at 540-575 ℃ for long-time nitrogen atom diffusion, and the nitrogen atoms diffused on the surface of the die permeate into the surface of the die to form a permeation layer, and the permeation layer can improve the high temperature resistance and the thermal fatigue resistance of the die material; at the same time of forming nitrogen atom penetrating layer on the surface of the mould, a layer of nitriding white layer is formed on the surface of the mould, and the nitriding white layer is positioned outside the penetrating layer, and the hardness is about 70HRC (the hardness of the surface of the mould is 46-48HRC generally). Since the nitrided white layer is decomposed into austenite in an environment above 592 ℃, once the nitrided white layer is decomposed into austenite at a high temperature, thermal fatigue cracks are formed on the surface of the mold in advance, thereby affecting the normal use of the mold, and when the mold is applied to the mold cavity in the later period, the temperature in the mold cavity is generally above 600 ℃. The nitrided white layer formed during the nitriding treatment of the mold surface is definitely harmful, affecting the use of the mold in a high temperature environment in the later stage. The mold therefore requires removal of the high hardness white nitride layer from the mold surface prior to use. In the prior art, the acid washing mode is generally adopted to remove the nitriding white layer on the surface of the die, so that the nitriding white layer is not uniformly and thoroughly removed, and the acid washing operation is time-consuming, labor-consuming and difficult to operate.
Therefore, how to remove the nitride white layer on the surface of the mold while achieving shot peening strengthening on the surface of the mold has been a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to remove the nitriding white layer on the surface of the die while strengthening the surface of the die by shot blasting so as to ensure that the die has better thermal fatigue performance and mechanical strength and finally improve the service life and reliability of the die.
In order to solve the above problems, the present invention provides a shot peening method for die casting mold surface, comprising the steps of:
step 1), carrying out surface nitriding treatment on a die-casting die needing shot peening strengthening treatment, and forming a nitrogen atom penetration layer and a nitriding white layer on the surface of the die-casting die, wherein the hardness of the nitriding white layer is greater than that of the surface of the die-casting die;
step 2), performing preliminary shot peening strengthening treatment on the surface of the die casting mold by using a first shot peening medium with a first particle size and a first hardness;
step 3), performing secondary shot peening strengthening treatment on the surface of the die casting mold by using a second shot peening medium with a second particle size and a second hardness;
the first hardness is greater than the hardness of the surface of the die casting die, the second hardness is greater than the hardness of the nitriding white layer, and the second grain size is smaller than the first grain size; the spraying speed of the first shot medium in the step 2) and the spraying speed of the second shot medium in the step 3) are 80-250 m/s.
Compared with the prior art, the invention has the following advantages: according to the invention, the surface nitriding treatment is carried out on the die-casting die in the step 1), compared with the die-casting die without the surface nitriding treatment, the die-casting die after the surface nitriding treatment has better thermal fatigue resistance, and the high temperature resistance of the die-casting die can be obviously improved after the surface nitriding treatment of the die-casting die; according to the invention, step 2) is carried out preliminary shot peening strengthening treatment on the die casting die subjected to surface nitriding treatment by using a first shot peening medium with hardness larger than that of the die casting die surface, and after the preliminary shot peening strengthening treatment, the die casting die surface can obtain higher compressive stress, so that the thermal fatigue resistance of the die casting die surface is further improved; the method comprises the following steps of 3) carrying out secondary shot peening on the surface of the die casting mold subjected to primary shot peening strengthening treatment by using a second shot peening medium with hardness larger than that of the nitrided white layer, thoroughly removing the nitrided white layer on the surface of the die casting mold after the secondary shot peening strengthening treatment, further improving the thermal fatigue resistance of the die casting mold, measuring the surface of the die casting mold through the compression stress amplitude and the compression stress action range, wherein the compression stress amplitude can reach 870MPA to 970MPA, and the compression stress action depth can reach 0.2-0.3 mm; in addition, during primary shot peening and secondary shot peening, the first shot peening medium and the second shot peening medium can impact honeycomb pits on the surface of the die casting mold, the smaller the particle size of the shot peening medium is, the denser the honeycomb pits are, and the higher the smoothness of the surface of the die casting mold.
Further, the first shot medium is SPM30 high-speed steel shot with the grain diameter of 0.1-1.0 mm and the hardness of 60-65 HRC. Compared with the common steel balls, the SPM30 high-speed steel shot has higher hardness, larger grain diameter and larger mass, and the impact force of the SPM30 high-speed steel shot on the surface of the die casting die is larger during injection operation, so that the surface of the die casting die is easier to deform, and the surface of the SPM30 high-speed steel shot with larger grain diameter is easier to cover microcracks at the R angle of the die casting die, so that the microcracks at the R angle of the die casting die are repaired.
Further, the second shot medium is Fe-Cr-B shot having a particle size of 0.04-0.12 mm and a hardness of greater than 72HRC. During processing, fe-Cr-B pellets with smaller particle size than SPM30 high-speed steel pellets are selected, the surface finish of a die casting mold can be improved when the Fe-Cr-B pellets are sprayed on the surface of the die casting mold, and the surface finish of the mold sprayed by the Fe-Cr-B pellets can be controlled within the range of 2-3 micrometers to achieve a matte grade; meanwhile, as the hardness of the Fe-Cr-B pellets is larger than that of the nitrided white layer on the surface of the die casting mold, when the Fe-Cr-B pellets are used for spraying the surface of the die casting mold, the Fe-Cr-B pellets break the nitrided white layer on the surface of the die casting mold more easily, so that the nitrided white layer which remains on the surface of the die casting mold after being subjected to one-time impact of the SPM30 high-speed steel pellets can be thoroughly removed.
Further, the ejection speed of the second shot medium in the step 3) is 100 to 200 m/s. When the injection speed of the shot blasting medium is too low, the impact force of the shot blasting medium on the surface of the die is insufficient, the shot blasting strengthening effect of the surface of the die can be weakened, when the injection speed of the shot blasting medium is too high, sparks can be generated at the same time when friction heat is generated between the shot blasting medium and the surface of the die, the sparks can change the structure of the surface of the die, and the hardness of the surface of the die is reduced; after the step 2) of spraying the first shot medium to preliminarily remove the nitrided white layer on the surface of the die, the step 3) of setting the spraying speed of the second shot medium to be 100-200 m/s can completely remove the nitrided white layer on the surface of the die, and sparks are not generated when the second shot medium sprays the surface of the die, so that a better processing effect is achieved.
Further, in the step 2), the first shot blasting medium is uniformly sprayed on the surface of the die casting mold by using a compression type shot blasting device, the spraying times are at least three times, and the air pressure in the shot blasting device is 6-8 kg/square cm. Through evenly spraying the first shot blasting medium on the surface of the die casting die for a plurality of times, the uniformity of shot blasting can be improved, and the spraying coverage rate can be improved for complex die casting dies, particularly dies with R angles.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of embodiments of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In this embodiment, the shot peening method for the surface of the die casting mold includes the following steps:
step 1), carrying out surface nitriding treatment on a die-casting die needing shot peening strengthening treatment, and forming a nitrogen atom penetration layer and a nitriding white layer on the surface of the die-casting die, wherein the hardness of the nitriding white layer is greater than that of the surface of the die-casting die; the surface hardness of the die casting mold is generally 46-48HRC, and the hardness of the nitriding white layer formed on the surface of the die casting mold is generally about 70HRC after the surface of the die casting mold is nitrided; compared with a die-casting die without surface nitriding, the die-casting die with the surface nitriding is better in thermal fatigue resistance, and the high temperature resistance of the die-casting die can be remarkably improved after the surface nitriding.
Step 2), placing the die-casting mould subjected to surface nitriding treatment in compression type shot blasting equipment, and performing preliminary shot blasting strengthening treatment on the surface of the die-casting mould by using a first shot blasting medium with hardness greater than that of the die-casting mould, wherein the air pressure in the shot blasting equipment is 6-8 kg/square cm; during primary shot peening strengthening operation, the first shot peening medium is shot uniformly on the surface of the die casting mold for more than three times at the speed of 80-250 m/s; the first shot medium is typically SPM30 high-speed steel shot with a grain size of 0.1-1.0 mm and a hardness of 60-65HRC, preferably SPM30 high-speed steel shot with a grain size of 1.0 mm and a hardness of 64HRC. Compared with the common steel balls, the SPM30 high-speed steel shot has higher hardness, larger grain diameter and larger mass, and the impact force of the SPM30 high-speed steel shot on the surface of the die casting die is larger during the injection operation, so that the surface of the die casting die is easier to deform. And the SPM30 high-speed steel shot injection die-casting die surface with larger particle size is easier to cover microcracks at the R angle of the die-casting die. After preliminary shot peening, the surface of the die casting mold can obtain higher compressive stress, so that the thermal fatigue resistance of the surface of the die casting mold is further improved, and during the preliminary shot peening, the impact force of the first shot peening medium can break up part of the nitrided white layer on the surface of the die casting mold, and the nitrided white layer is primarily removed from the surface of the die casting mold. After nitriding treatment of the die casting die, if a nitriding white layer exists on the surface of the die, not only is thermal fatigue cracks easily generated on the surface of the die, but also microcracks are formed at the R angle of the die. Under the combined action of the impact of the SPM30 high-speed steel shot and the metal ductility of the die casting die, the repairing effect on the thermal fatigue crack on the surface of the die casting die and the microcrack at the R angle of the die casting die can be realized.
Step 3), placing the die-casting mould subjected to the surface preliminary shot peening treatment in suction type shot peening equipment, and performing secondary shot peening treatment on the surface of the die-casting mould by using a second shot peening medium with hardness larger than that of the nitrided white layer of the surface of the die-casting mould and with particle size smaller than that of the first shot peening medium; in the secondary shot peening operation, the second peening medium is shot at a shot velocity of 80 to 250 m/s, preferably 100 to 200 m/s; the second shot medium is typically selected from Fe-Cr-B shot having a particle size of 0.04-0.12 mm and a hardness of greater than 72HRC, preferably 0.08 mm and a hardness of 72HRC. During primary shot peening and secondary shot peening, the SPM30 high-speed steel shot in the step 2) and the Fe-Cr-B shot in the step 3) are sprayed on the surface of the die casting die to form honeycomb pits, the smaller the particle size of a shot blasting medium is, the denser the honeycomb pits are, the higher the smoothness of the surface of the die casting die is, during processing, the Fe-Cr-B shot with the particle size smaller than that of the SPM30 high-speed steel shot is selected, the smoothness of the surface of the die casting die can be improved, and the smoothness of the die surface sprayed by the Fe-Cr-B shot can be controlled within the range of 2-3 microns to reach a matte level; meanwhile, as the hardness of the Fe-Cr-B pellets is larger than that of the nitrided white layer on the surface of the die casting mold, when the Fe-Cr-B pellets are used for spraying the surface of the die casting mold, the Fe-Cr-B pellets break the nitrided white layer on the surface of the die casting mold more easily, so that the nitrided white layer which remains on the surface of the die casting mold after being subjected to one-time impact of the SPM30 high-speed steel pellets can be thoroughly removed.
When the injection speed of the shot blasting medium is too low, the impact force of the shot blasting medium on the surface of the die is insufficient, the shot blasting strengthening effect of the surface of the die can be weakened, when the injection speed of the shot blasting medium is too high, sparks can be generated at the same time when friction heat is generated between the shot blasting medium and the surface of the die, the sparks can change the structure of the surface of the die, and the hardness of the surface of the die is reduced; after the step 2) of spraying the first shot medium to preliminarily remove the nitrided white layer on the surface of the die, the step 3) of setting the spraying speed of the second shot medium to be 100-200 m/s can completely remove the nitrided white layer on the surface of the die, and sparks are not generated when the second shot medium sprays the surface of the die, so that a better processing effect is achieved.
After the shot peening strengthening treatment is carried out twice, an X-Ray stress diffractometer is used for analyzing the compressive stress amplitude and the compressive stress action range of the surface of the die casting die, the compressive stress amplitude can reach 870 to 970MPA, and compared with the compressive stress amplitude of 600MPA in the prior art, the compressive stress action depth can reach 0.2 to 0.3 millimeter. Metallographic detection shows that after the primary shot peening strengthening treatment and the secondary shot peening strengthening treatment, the nitrided white layer on the surface of the die casting die is thoroughly removed, honeycomb pits are punched on the surface of the die casting die, and the honeycomb pit structure can strengthen the mechanical strength of the die casting die.
According to the invention, the surface of the die casting die is subjected to surface nitriding treatment and then shot peening strengthening treatment, so that the thermal fatigue resistance and the high temperature resistance of the surface of the die casting die are obviously improved, and the service life and the reliability of the die are improved.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (5)
1. A shot peening strengthening method for the surface of a die casting mold comprises the following steps:
step 1), carrying out surface nitriding treatment on a die-casting die needing shot peening strengthening treatment, and forming a nitrogen atom penetration layer and a nitriding white layer on the surface of the die-casting die, wherein the hardness of the nitriding white layer is greater than that of the surface of the die-casting die;
step 2), performing preliminary shot peening strengthening treatment on the surface of the die casting mold by using a first shot peening medium with a first particle size and a first hardness;
step 3), performing secondary shot peening strengthening treatment on the surface of the die casting mold by using a second shot peening medium with a second particle size and a second hardness;
the method is characterized in that: the first hardness is greater than the hardness of the surface of the die casting die, the second hardness is greater than the hardness of the nitriding white layer, and the second particle size is smaller than the first particle size; the spraying speed of the first shot blasting medium in the step 2) and the spraying speed of the second shot blasting medium in the step 3) are all 80-250 m/s.
2. The shot peening method of a die casting mold surface according to claim 1, wherein: the first shot blasting medium is SPM30 high-speed steel shot with the grain diameter of 0.1-1.0 mm and the hardness of 60-65 HRC.
3. The shot peening method of a surface of a die casting mold according to claim 2, characterized in that: the second shot blasting medium is Fe-Cr-B shot with the particle size of 0.04-0.12 mm and the hardness of more than 72HRC.
4. The shot peening method of a die casting mold surface according to claim 1, wherein: the spraying speeds of the second shot blasting media in the step 3) are 100-200 m/s.
5. The shot peening method of a die casting mold surface according to claim 1, wherein: and in the step 2), the first shot blasting medium is uniformly sprayed on the surface of the die casting die by using compression type shot blasting equipment, the spraying times are at least three times, and the air pressure in the shot blasting equipment is 6-8 kg/square cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310318635.5A CN116463483A (en) | 2023-03-29 | 2023-03-29 | Shot peening strengthening method for die casting die surface |
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| CN202310318635.5A CN116463483A (en) | 2023-03-29 | 2023-03-29 | Shot peening strengthening method for die casting die surface |
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| JP2007056333A (en) * | 2005-08-25 | 2007-03-08 | Toyota Motor Corp | Method for shot-peening nitrided member, and nitrided member treated with the method |
| JP2009270150A (en) * | 2008-05-07 | 2009-11-19 | Togo Seisakusho Corp | Method for manufacturing coil spring |
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| KR101781816B1 (en) * | 2017-01-12 | 2017-09-26 | 박명석 | Composite surface treatment method for improving lifetime of die casting mold |
| CN106863142A (en) * | 2017-02-22 | 2017-06-20 | 河北工业大学 | A kind of method of gear composite surface intensive treatment |
| JP2020111803A (en) * | 2019-01-15 | 2020-07-27 | 愛知製鋼株式会社 | Method for manufacturing surface hardened steel component |
| CN115176039A (en) * | 2020-02-28 | 2022-10-11 | 赛峰公司 | Method for producing a nitrided steel component |
| CN112011674A (en) * | 2020-08-28 | 2020-12-01 | 东风商用车有限公司 | Composite shot blasting strengthening method for steel plate spring |
| CN112760469A (en) * | 2020-12-28 | 2021-05-07 | 中国科学院宁波材料技术与工程研究所 | Surface modification method of metal material |
| CN114986399A (en) * | 2021-03-02 | 2022-09-02 | 新东工业株式会社 | Shot peening method |
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