WO2011052287A1 - 亜鉛基合金ショット - Google Patents

亜鉛基合金ショット Download PDF

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Publication number
WO2011052287A1
WO2011052287A1 PCT/JP2010/064443 JP2010064443W WO2011052287A1 WO 2011052287 A1 WO2011052287 A1 WO 2011052287A1 JP 2010064443 W JP2010064443 W JP 2010064443W WO 2011052287 A1 WO2011052287 A1 WO 2011052287A1
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WIPO (PCT)
Prior art keywords
based alloy
zinc
shot
mass
alloy shot
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Application number
PCT/JP2010/064443
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English (en)
French (fr)
Japanese (ja)
Inventor
英二 山口
竜也 竹上
後藤　賢
隼人 谷口
Original Assignee
新東工業株式会社
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Application filed by 新東工業株式会社 filed Critical 新東工業株式会社
Priority to CN201080043347.4A priority Critical patent/CN102574274B/zh
Priority to JP2011538293A priority patent/JP5007776B2/ja
Priority to BR112012007528A priority patent/BR112012007528A2/pt
Priority to KR1020127007236A priority patent/KR101237904B1/ko
Publication of WO2011052287A1 publication Critical patent/WO2011052287A1/ja
Priority to US13/435,525 priority patent/US20120294756A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/083—Deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086—Descaling; Removing coating films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/02—Alloys based on zinc with copper as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent

Definitions

  • the present invention relates to the removal of burrs and burrs from non-ferrous metal parts (hereinafter referred to as “deburring”), as well as, for example, aluminum die-cast products and cast aluminum products, as well as sand removal, coating and release agents for cast products.
  • deburring non-ferrous metal parts
  • aluminum die-cast products and cast aluminum products as well as sand removal, coating and release agents for cast products.
  • cleaning For the purpose of improving the fatigue strength of welded parts of shot blasting and non-ferrous metal parts or non-ferrous metal parts for the purpose of removing seizure of metal or removing oxide films and hot water wrinkles (hereinafter referred to as “cleaning”)
  • cleaning a shot for projection processing (spraying processing) used in shot peening.
  • Vickers hardness means a value measured according to JIS Z 2244 under the conditions of test force 0.4093N and test force holding time: 10 to 15s, and is displayed as "XXXXX 0.05". It is simply abbreviated as “XXOOHV”.
  • alloy composition means “mass%” unless otherwise specified.
  • molded products For die-cast products made of non-ferrous metals, such as aluminum-based alloys, zinc-based alloys, or Mg-based alloys that have been used in automotive parts, etc., deburring and polishing of molded products (molded products) As a target surface treatment, shot blasting, in which a small sphere called a shot is projected onto a workpiece at high speed, is often used.
  • a shot material used for this shot blasting a shot made of an aluminum-based alloy, stainless steel, or zinc-based alloy has been generally used.
  • Aluminum-based alloy shots have a low specific gravity, so the polishing ability of the product to be processed is not sufficient, and the explosion sensitivity of dust clouds due to shot crushing that occurs during shot blasting is high based on the material properties of aluminum, Moreover, the lower explosion limit is low. For this reason, extra work safety management is required.
  • Stainless shot includes Ni (Decree No. 231) and Cr (Decree No. 68) that are subject to the chemical release and transfer notification system (PRTR “Pollutant Release and Transfer Register” system). For this reason, it is in the direction of use restriction from the viewpoint of work safety and environmental conservation.
  • PRTR Chemical Release and Transfer Register
  • Zinc-based alloy shots have a lower dust cloud explosion sensitivity and higher explosion lower limit concentration than shots of aluminum-based alloy shots and stainless steel shots. For this reason, it has been most frequently used in recent years as shots for shot blasting and shot peening of die-cast products made of non-ferrous metals in terms of safety.
  • Patent Documents 1 to 5 and the like exist as prior art documents related to zinc-based alloy shots, which do not affect the patentability of the present invention.
  • Patent Document 2 a technique of adding Mn (addition amount: 0.3 to 5.0%) as an additive element is proposed in order to improve shot durability.
  • Mn is also subject to the PRTR system (decree number 311) and has the same problems as stainless steel shots.
  • the present inventors have added elements of Zn and Al to adjust the alloy composition to a specific alloy composition.
  • the inventors have found that there is an alloy composition that can produce a zinc-based alloy shot having a Vickers hardness of about 100 HV or higher and having high toughness without adding, and have arrived at the present invention having the following constitution.
  • FIG. 1 schematically shows the composition range (gray part) of the present invention in the phase diagram of the ternary alloy composition of the zinc-based alloy shot.
  • Al is added as an alloy element (essential element) in order to improve impact resistance, which is a mechanical property that greatly affects the amount of shot consumption.
  • Al has the effect of increasing the impact resistance (toughness), mechanical strength and Vickers hardness of the zinc alloy. If the addition amount of Al (100% based on the total amount; the same applies hereinafter) is less than 0.5%, it is difficult to obtain these effects, and if it exceeds 6.5%, the impact resistance tends to decrease.
  • a suitable addition amount of Al for increasing impact resistance is 3.0 to 6.0 mass%, preferably about 3.0 to 5.0. %.
  • Cu is used as an additive element in order to improve the Vickers hardness of the zinc-based alloy shot.
  • Cu has the effect of increasing the mechanical strength and Vickers hardness of the zinc alloy, and it is difficult to obtain these effects when the added amount of Cu is less than 0.5%.
  • the addition amount of Cu exceeds 4.5% or the total addition amount of Al and Cu exceeds 10.5%, the mechanical strength and Vickers hardness are improved, but the impact resistance tends to decrease (toughness). Is reduced.
  • the most preferable addition amount of Cu is about 1.0 to 3.0%. It is.
  • the Vickers hardness is less than 90 HV as described above, the deburring ability and the scouring ability are not sufficient, but if it exceeds 190 HV, the zinc base is used at the time of deburring, scouring and peening. It is not practical because cracks and wear of alloy shots are likely to progress, and the amount of shot consumption increases. This is due to the low toughness of the zinc-based alloy shot. Therefore, a Vickers hardness having a sufficient deburring ability, a sharpening ability and a peening ability and having a low shot wear amount (high toughness) is easily obtained: 90 to 190 HV, preferably 130 to 154 HV.
  • the shot is appropriately selected according to the processing target (product) and processing purpose.
  • the content of elements (non-essential elements) other than the three components (Zn, Al, Cu) contained in the zinc-based alloy shot 0.5% or less, and the Fe content: 0. It is desirable to make it 3% or less.
  • non-essential elements examples include Pb, Fe, Cd, Sn, Si, Ti, Mn, As, Sb, Bi, and S. If the total of these non-essential elements exceeds 0.5%, the zinc-based alloy shot is brittle and the toughness tends to be low. In particular, Fe has an adverse effect on toughness, and when the total content of Fe exceeds 0.3% in a zinc-based alloy shot, the amount of shot wear increases and is not practical as a shot (Comparative Example 1- 6, see Comparative Example 2-3).
  • the purity of the additive elements Al and Cu is 99.9% or more, and the content of non-essential elements is 0.02% or less in total.
  • Example 2-3 the reduction in toughness caused by the entry of non-essential elements (impurities) contained in Al and Cu and oxides of the non-essential elements into grain boundaries.
  • Another invention is a four-component composition containing Al: 0.5 to 6.5%, Cu: 0.5 to 4.5%, and Mg: 0.01 to 0.2% as additive elements.
  • a zinc-based alloy shot of the system wherein the mass composition ratio of Al and Cu (Al / Cu): 1.0 to 13.0, the total amount added (Al + Cu): 1.5 to 8.0%, and Vickers hardness: 90 to 190 HV, preferably 140 to 150 HV.
  • the metal structure produced by repeatedly using the zinc-based alloy shot of the first invention is used.
  • a trace amount of Mg is used as an additive element.
  • Mg has the effect of precipitating an Mg compound at the crystal interface of the zinc alloy to suppress recrystallization, and also improving the mechanical strength and Vickers hardness. If Mg: less than 0.01%, it is difficult to obtain an effect of suppressing recrystallization, and if it exceeds 0.2%, the effect of improving the impact resistance by the addition of Al or Cu may be hindered.
  • the additive element composition for obtaining a zinc-based alloy shot having a Vickers hardness of around 140 HV is Al: 3.0 to 5.0% and Cu: 1.0 to 3.0%, suitable addition of Mg The amount is 0.01-0.2%, preferably 0.03-0.08%.
  • the Vickers hardness of around 140HV is a shot hardness at which a good shot blasting or shot peening effect can be easily obtained for non-ferrous metal products.
  • the content of non-essential elements other than the four components contained in the zinc-based alloy shot is 0.5% or less, and the Fe content is 0.00. It is desirable to set it to 3% or less. The reason for limiting the contents of these non-essential elements is the same as in the first invention.
  • the purity of each of the additive elements Al, Cu, and Mg is preferably 99.9% by mass or more. The reasons for limiting their purity are the same as in the first invention.
  • the raw materials (bullion) of Al, Cu and Zn are as described above, and the magnesium raw metal 1 of JISH2150 (or ISO 8287: 2000) is used as the Mg raw material (bullion). Species (99.90% or more) can be mentioned.
  • the average particle size of the zinc-based alloy shots in the first and second inventions is usually 0.1 to 3.0 mm, preferably 0. It can be 3 to 2 mm.
  • the average particle size of the shot is set to 0.1 to 3.0 mm, preferably 0.3 to 2 mm, a high polishing effect is exhibited and surface treatment such as deburring of the workpiece is performed within a short time. It can be carried out.
  • the average particle size of the shot is 0.3 to 0.6 mm, a beautiful surface skin with less rough skin can be obtained.
  • the zinc-based alloy shots of the first and second inventions comprise a step of dripping a molten metal into a cooling medium such as water, and in this cooling medium, the dripped metal melt is solidified to form granules. Granules that have been subjected to the deposition step and the solidification / drying step are classified and manufactured.
  • the molten metal Since the molten metal is drastically cooled by dripping the molten metal into the cooling medium, it becomes a fine and uniform structure as compared with general casting materials.
  • a very large external force is applied to the zinc-based alloy shot, so a fine and uniform structure improves mechanical properties such as impact resistance and tensile strength. It can be suitably used as a zinc-based alloy shot.
  • the zinc-based alloy shot of the present invention is a zinc-based alloy, the explosion sensitivity of the dust cloud resulting from shot crushing is low and the lower explosion limit concentration is high, so that a highly safe zinc-based alloy shot can be provided.
  • the zinc-based alloy shot of the present invention has a high hardness (Vickers hardness of 90 HV or more), it has high deburring and polishing capabilities by shot blasting, and can perform shot blasting in a short time and has high productivity. .
  • the consumption of zinc-based alloy shots is reduced, and the amount of dust generated due to shot crushing is also reduced.
  • the zinc-based alloy shot of the present invention when used in shot pinning, the zinc-based alloy shot of the present invention, which has high hardness and high toughness, efficiently causes plastic deformation on the surface layer of the article to be processed and imparts compressive residual stress. It is possible. In addition, the amount of dust generated due to shot crushing is reduced as in the case of use in shot blasting.
  • the mechanical strength of the shot due to recrystallization of the metal structure is relatively small, and the Vickers hardness during use of the zinc-based alloy shot is stabilized. For this reason, as an effect thereof, there is less variation in the finish of the processed product after shot blasting or shot peening, and the surface treatment quality is also stabilized.
  • the zinc-based alloy shot of the present invention has a low dust generation amount and does not contain Mn and the like that are subject to the PRTR system, which is desirable from the viewpoint of environmental protection and work safety.
  • an ingot (raw material) 12 of a base element (Zn) and additive elements (Al, Cu, and further Mg) is weighed and put into a crucible 14 so as to have a set alloy composition ratio.
  • the crucible 14 is heated by a heating means (resistance heating) 15 to melt the charged ingot (ingot) mixture to obtain a molten metal 16.
  • the melting and heating temperature at this time varies depending on the alloy composition and production scale, but is normally set appropriately in the range of 550 to 700 ° C. (preferably 580 to 600 ° C.).
  • the melting point of each element is as follows.
  • the molten metal 16 is put into the molten metal holding container 18.
  • the molten metal holding container 18 is provided with a heating means (resistance heating) 20, and can be held so that the molten metal 16 is not cooled more than necessary during the manufacture of the zinc-based alloy shot.
  • the molten metal holding temperature at this time varies depending on the alloy composition and production scale, but is usually set appropriately in the range of 500 to 600 ° C. (preferably 520 to 550 ° C.).
  • a dripping nozzle 22 for dripping molten metal is provided at the bottom of the molten metal holding container 18, and a cooling medium 24 such as water is introduced into the lower portion of the nozzle 22, and a cooling means (cooling tower) 26 is attached.
  • a tank 28 is arranged.
  • the cooling medium 24 may be oil.
  • the molten metal 16 in the molten metal holding container 18 When the molten metal 16 in the molten metal holding container 18 is dropped from the dropping nozzle 22, the molten metal 16 comes into contact with air when passing through the dropping nozzle 22 and the cooling medium 24, and further, due to contact with the cooling medium 24. As it cools, it spheroidizes under the influence of surface tension.
  • the shape of the droplet of the molten metal 16 is not a perfect sphere but becomes a distorted sphere or ellipse stretched in the dropping direction. For this reason, the shape of the obtained granular material 30, that is, the shot particle is a slightly distorted spherical shape, a spheroid shape, or a cylindrical shape with rounded corners.
  • a / b of 60% or more shots is 1.0 to It is preferable to be within the range of 1.2.
  • Such a shot is close to a true sphere and has a small variation in shape, so that a more uniform cleaning effect can be obtained.
  • the shot projection drawing can be obtained by a known means such as microscopic observation or image analysis by imaging.
  • the temperature of the cooling medium 24 rises when the molten molten metal comes into contact with the cooling medium 24, thereby causing a rapid cooling of the molten molten metal. For this reason, the cooling medium 24 holds the cooling medium 24 at the set temperature.
  • the set cooling temperature is usually 60 ° C. or less (preferably 30 to 40 ° C.). If the temperature exceeds 60 ° C., the water in contact with the molten melt (droplet) will boil and the interface will be in a vaporized state, making it difficult to exhibit a rapid cooling action.
  • a zinc alloy granule 30 is deposited on the bottom of the cooling medium 24. This is recovered, dried with a dryer (rotary dryer) 32, and then classified with a classifier (vibrating sieve) 34 to obtain a zinc-based alloy shot. The classification is performed so as to obtain a predetermined particle size according to the intended use of the zinc-based alloy shot.
  • the manufacturing method of a zinc base alloy shot is not limited to the said drop granulation method.
  • known methods such as a gas atomizing method, a centrifugal atomizing method, and a water atomizing method can be appropriately selected according to the shape, particle size, and the like of the target zinc-based alloy shot.
  • Examples 1-1 to 1-8 and Comparative Examples 1-1 to 1-6 are the first invention, Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-3 are the second invention, Each corresponds.
  • the following raw materials were used as raw materials for alloy elements.
  • the Fe content (allowable upper limit value) is added together with the purity (lower limit value) of JIS regulations for each gold. Note that Fe of “No. 1 copper wire scrap” is an estimated value.
  • each alloy shot was carried out in the method shown in FIG. 2 (drop granulation method) with the alloy composition shown in Tables 1 and 2 under the following conditions.
  • the total impurities are 0.014 to 0.092% in Examples 1-1 to 1-8 and Examples 2-1 to 2-3, and Comparative Examples 1-1 to 1-6 and Comparative Examples 2-1 to 2-3 was 0.032 to 0.378.
  • the zinc-base alloy was shot so that the recrystallization phenomenon of the metallographic structure of the zinc-based alloy shot was considered to be sufficiently stable. What adjusted the condition of the shot was used.
  • Evaluation items were as follows regarding “shot wear amount” corresponding to toughness (impact resistance), “deburring ability” corresponding to blasting ability, and “scouring ability”.
  • A 0.06 kg / (h ⁇ HP) or less, ⁇ : 0.06 kg / (h ⁇ HP) over 0.08 kg / (h ⁇ HP) or less, ⁇ : 0.08 kg / (h ⁇ HP) more than 0.10 kg / (h ⁇ HP) or less, X: Over 0.10 kg / (h ⁇ HP).
  • A The shot blasting time is 30 seconds and the deburring can be performed and the result is very good.
  • ⁇ Deburrable in 60 seconds and good results
  • ⁇ Deburring can be performed in 90 seconds and the result is slightly poor.
  • X Defects that cannot be deburred even after 90-second shot blasting.
  • Comparative Examples 1-2 and 1-3 which have an excessive amount of Al added (over 6.5%), have shot impact resistance (toughness) decreased due to excessive addition of Al.
  • the consumption amount of was slightly larger “ ⁇ ”.
  • Comparative Examples 1-2 and 1-3 although the specific gravity of the zinc-based alloy shot was reduced due to the excessive addition of Al, and the Vickers hardness was improved, the processed material of the zinc-based alloy shot The impact force to the is reduced. For this reason, Comparative Examples 1-2 and 1-3 had reduced deburring ability and scouring ability.
  • the overall evaluation of the zinc-based alloy shot was a slightly poor “ ⁇ ”.
  • Zinc-based alloy shots of Examples 1-1 to 1-3 in the range of 0.5 to 6.5% have high impact resistance and very little shot consumption. ⁇ ”.
  • the zinc-base alloy shots of Examples 1-2 and 1-3 having a Vickers hardness of 130 HV or higher have both high deburring ability and sharpening ability, and the overall evaluation of the zinc-base alloy shot is extremely good. Things became “ ⁇ ”.
  • the zinc-based alloy shot of Comparative Example 1-4 with less Cu addition (less than 0.5%) has a very low shot consumption, but the Vickers hardness is low. However, the overall evaluation of the zinc-based alloy shot was slightly poor, “ ⁇ ”.
  • the zinc-based alloy shot of Comparative Example 1-5 with an excessive amount of added Cu is 190 HV, which is extremely hard as a zinc alloy, and the deburring ability and the scavenging ability were evaluated as “ ⁇ ”.
  • excessive addition of Cu resulted in a decrease in shot toughness, resulting in an increase in shot wear amount of “ ⁇ ”. This is due to the fact that the toughness of the zinc-based alloy shot decreases with increasing Cu content.
  • Example 1-1 (Vickers hardness 92HV) and Conventional Example 1 (Vickers hardness HV88), Example 1-2 (Vickers hardness 130HV) and Conventional Example 2 (Vickers) related to the zinc-based alloy shot of the first invention
  • the hardness HV129 is almost the same as the Vickers hardness
  • the zinc-based alloy shot of the present invention is superior in deburring ability and polishing ability.
  • zinc alloys tend to decrease in hardness due to the progress of recrystallization due to aging, changing the metal structure.
  • pre-projection for 8 hours is performed on the assumption that the shot state after recrystallization is the actual shot blast operation state. It is presumed that the zinc-base alloy shots of the conventional examples 1 and 2 have a lower rate of hardness than the zinc-base alloy shots of the present invention, so that the deburring ability and the polishing ability are inferior. Is done.
  • Example 1 using a high-purity material In the case of -6, the Vickers hardness was slightly lower, but the shot consumption was less and better results were obtained.
  • Comparative Example 1-6 when the amount of Fe contained in the zinc-based alloy shot is small (Example 1-4) and when it is large (Comparative Example 1-6), Comparative Example 1-6 in which the Fe content is excessive As a result, the Vickers hardness decreased and the shot wear amount, the deburring ability, and the cleaning ability all decreased.
  • the pre-projection for 8 hours is considered to be almost the same as the actual shot peening operation after the recrystallization phenomenon of the microstructure of the zinc-based alloy shot is considered to be sufficiently stable.
  • shot peening was performed. Table 4 shows the Vickers hardness of the zinc-based alloy shot after the preliminary projection.
  • the AC4CH continuous cast material was subjected to solution treatment at 520 ° C. for 8 hours, then water-cooled, left for 12 hours, and then aged at 160 ° C. for 6 hours.
  • the thickness was 5 mm, the width was 15 mm, and the parallel part was 17 mm long.
  • a strip-shaped test piece was used.
  • the shot peening evaluation was performed for the following items.
  • Evaluation items were as follows for “improvement rate of compressive residual stress” and “toughness (impact resistance)” corresponding to the peening effect.
  • A 0.06 kg / (h ⁇ HP) or less, ⁇ : 0.06 kg / (h ⁇ HP) over 0.08 kg / (h ⁇ HP) or less, ⁇ : 0.08 kg / (h ⁇ HP) more than 0.10 kg / (h ⁇ HP) or less, X: Over 0.10 kg / (h ⁇ HP).
  • the zinc-based alloy shots of Examples 1-2 to 1-5 which are the zinc-based alloy shots of the first invention, have a Vickers hardness of about 27 to 45% and a Vickers hardness of 90 to 97 HV due to preliminary projection. became.
  • the metal structure is recrystallized by repeated use of the zinc-based alloy shot and the mechanical strength and Vickers hardness of the zinc-based alloy shot are reduced. I understood that. That is, when the total of Al and Cu is less than 7.5%, it is not necessarily optimal as a shot for shot peening.
  • the hardness of the zinc-based alloy shot is lower than the Vickers hardness of 104 HV of the processed product, and the surface layer of the processed product is sufficiently plastically deformed.
  • the “improvement rate of compressive residual stress” was less than 200%.
  • the overall evaluation of the zinc-based alloy shots of Examples 1-2 to 1-5 was a slightly poor “ ⁇ ”.
  • the zinc-based alloy shot of the first invention has a Vickers hardness of about 29 by preliminary projection. Although reduced by ⁇ 32%, the Vickers hardness before preliminary projection was as high as 180 to 183 HV, and the Vickers hardness after preliminary projection was 122 to 130 HV. As a result of ensuring a Vickers hardness higher than 104 HV of the workpiece, the zinc-based alloy shots of Examples 1-6 and 1-7 may cause sufficient plastic deformation in the surface layer of the workpiece. It was possible to obtain an evaluation of “ ⁇ ” having an extremely high peening effect with an “improvement rate of compressive residual stress” of 250% or more. The evaluation of “ ⁇ ” in which the shot consumption was small, and the overall evaluation of the zinc-based alloy shots of Examples 1-7 and 1-8 was “Good”.
  • Comparative Example 2-1 according to the second invention is 0.001% where the amount of Mg added is too small (Mg: less than 0.01%). Although the effect of suppressing the recrystallization reaction was not obtained although Mg was added, the Vickers hardness after the preliminary projection was reduced to 92 HV (down 36%).
  • the zinc-based alloy shot of Comparative Example 2-2 is 0.3% with an excessive amount of Mg (over 0.2%).
  • Mg molecular weight
  • the recrystallization of the metal structure due to repeated use was suppressed, and the decrease in Vickers hardness after preliminary projection was only about 6 to 12%.
  • the absolute value of the Vickers hardness after the preliminary projection is 123 to 141 HV, which is sufficiently higher than the Vickers hardness 104 HV of the workpiece.
  • the surface layer of the article to be processed can be sufficiently plastically deformed, and the “improvement rate of compressive residual stress” is 250% or more, which is an extremely high pinning effect. ⁇ ”.
  • “shot consumption” is extremely small “ ⁇ ” (Examples 2-1 and 2-3), and small “ ⁇ ” (Examples) 2-2).
  • the overall evaluation of this zinc-based alloy shot was very good (Example 2-3) and good (circle) (Examples 2-1 and 2-2).
  • the zinc base alloy shots of the first and second embodiments of the present invention have a high hardness (100 HV or higher) and high hardness, which were difficult to obtain with conventional zinc base alloy shots. It was confirmed that both toughness was achieved.
  • Comparative Example 2-3 having a high Fe content is The Vickers hardness, the Vickers hardness after preliminary projection, and the residual compressive stress all decreased, and the overall evaluation was “x”.

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  • Chemical & Material Sciences (AREA)
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PCT/JP2010/064443 2009-10-30 2010-08-26 亜鉛基合金ショット WO2011052287A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201080043347.4A CN102574274B (zh) 2009-10-30 2010-08-26 锌基合金丸
JP2011538293A JP5007776B2 (ja) 2009-10-30 2010-08-26 亜鉛基合金ショット
BR112012007528A BR112012007528A2 (pt) 2009-10-30 2010-08-26 projéteis fabricados a partir de liga à base de zinco
KR1020127007236A KR101237904B1 (ko) 2009-10-30 2010-08-26 아연계 합금 쇼트
US13/435,525 US20120294756A1 (en) 2009-10-30 2012-03-30 Shots made from zinc-based alloy

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JP2009250356 2009-10-30

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JP2015155145A (ja) * 2015-06-04 2015-08-27 新東工業株式会社 亜鉛基合金ショット
WO2018235903A1 (ja) * 2017-06-21 2018-12-27 新東工業株式会社 亜鉛基合金ショット及びその製造方法
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EP3200955A4 (en) * 2015-04-07 2018-08-29 Hewlett-Packard Development Company, L.P. Methods of polishing
FR3040013B1 (fr) * 2015-08-13 2018-02-23 Safran Aircraft Engines Procede de compactage d'une peinture anti-corrosion d'une piece de turbomachine
FR3061055B1 (fr) * 2016-12-26 2019-07-26 Safran Aircraft Engines Dispositif pour le traitement d'une piece metallique, procede et ensemble de projectiles associes
KR101910868B1 (ko) * 2017-02-28 2018-10-23 창원대학교 산학협력단 방향성 결정립을 갖는 아연-알루미늄 합금 및 그 제조방법
CN107699740A (zh) * 2017-10-09 2018-02-16 广州番禺于金属加工有限公司 一种锌合金及其制备方法及钥匙坯
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