WO2016143414A1 - 鋳物の研掃方法 - Google Patents
鋳物の研掃方法 Download PDFInfo
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- WO2016143414A1 WO2016143414A1 PCT/JP2016/053066 JP2016053066W WO2016143414A1 WO 2016143414 A1 WO2016143414 A1 WO 2016143414A1 JP 2016053066 W JP2016053066 W JP 2016053066W WO 2016143414 A1 WO2016143414 A1 WO 2016143414A1
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- projection material
- projection
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- particle diameter
- casting
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
Definitions
- the present disclosure relates to a blasting method in which blasting is performed to remove scales such as cast sand adhering to a casting surface after casting or rust formed on the surface of a base material.
- Non-Patent Document 1 shows a recommended particle size distribution after forming an operating mix in polishing a casting.
- a cast sand layer which is a relatively thick brittle material is formed in the outermost layer, and a scale layer, a scale and a base material mixed layer are formed in the lower layer.
- a cleaning method having a large cleaning force and high cleaning efficiency.
- Non-Patent Document 1 shows a recommended particle size distribution after forming an operating mix in the blasting of a casting, but a projection material having a larger blasting force and a higher blasting efficiency is used. There is a request for a cleaning method.
- a blasting method is a blasting method in which a blasting device projects a projection material onto the surface of a casting, and the projection material has a Vickers hardness (Japanese Industrial Standard). JIS Z 2244) is a projection material in the range of HV300 to 600, and the particle size distribution of the projection material is constant by the operation of the blasting device loading process and the blasting device loading process of the unused projection material into the blasting device.
- An operating mix forming process for forming a stable operating mix and a polishing process for projecting the projection material after the operating mix formation process onto the surface of the casting, and the particle size distribution of the projection material after the operating mix formation process is A first particle having a particle diameter of 1.18 mm, a second particle having a particle diameter of 1.18 mm or less and exceeding 0.85 mm, and a particle Following a third grain body 0.85 mm, when divided into, satisfying the (ratio of the first particle body) ⁇ (second grain body ratio of) ⁇ (the ratio of the third grain body).
- symbols with JIS are Japanese Industrial Standards.
- the particle size distribution of the projection material after the operating mix formation step includes a large amount of the first particles having a large scouring force, so as to ensure coverage. Then, the distribution is a characteristic distribution in which the second granule is contained in the second most and the third granule having a low scouring force is reduced.
- this blasting method can improve the scouring force by the first particles and shorten the scouring time, and can secure the coverage by the second spheroids. It is possible to realize a casting polishing method that improves both the sweep efficiency.
- the ratio of the first particles may be 60% by weight or more, the ratio of the second particles may be 5 to 30% by weight, and the ratio of the third particles may be 20% by weight or less.
- the ratio of the first particles is greatly increased compared to the conventionally recommended particle size distribution.
- the ratio of the second particles is a particle size distribution suitable for ensuring coverage. Therefore, this scouring method can achieve a particle size distribution suitable for scouring a casting with improved scouring power and scouring efficiency.
- the unused projection material includes a first projection material having a particle diameter d of 1.18 mm ⁇ d ⁇ 2.36 mm and a maximum frequency of a particle diameter section of 1.70 mm ⁇ d ⁇ 2.00 mm, and a particle diameter d. May be a mixture with the second projection material in which the frequency is 0.85 mm ⁇ d ⁇ 1.40 mm and the frequency of the particle diameter section 1.18 mm ⁇ d ⁇ 1.40 mm is maximized.
- the projection material can be produced by mixing the first projection material adjusted so as to improve the sharpening force and the second projection material adjusted so as to improve the coverage. .
- both the scouring force and the scouring efficiency can be improved.
- FIG. 1 is an explanatory diagram illustrating an example of a blasting apparatus used in the polishing method according to the embodiment. Note that the polishing method of the present embodiment is not limited to the method using the blast apparatus.
- the blast device 1 includes a hopper 11 that stores and supplies a fixed amount of the projection material, an impeller 12 that projects the projection material, a bucket elevator 13 that circulates the projection material, a projection material, sand, and scale (mainly iron oxide).
- a separator 14 a dust collector 15, a projection chamber 16, and a control device (not shown).
- the hopper 11 includes a storage portion 11a in which the projection material is stored, and a cut gate 11b that is provided below the storage portion 11a and for supplying the projection material to the impeller 12 in a fixed amount.
- the cut gate 11b has a variable opening area and can supply a certain amount of projection material to the impeller 12.
- the impeller 12 accelerates the projection material supplied from the hopper 11 with a rotating blade, and projects the projection material onto a workpiece (casting in the present embodiment) placed on the workpiece placement table 17 provided in the projection chamber 16. As a result, the casting is polished.
- a rotation mechanism 17 a such as a motor is connected to the workpiece mounting table 17. Thereby, the blast apparatus 1 can project a projection material on the whole workpiece
- the bucket elevator 13 is connected to the projection chamber 16.
- the projection chamber 16 has an inclined surface toward the bucket elevator 13.
- the blasting material after the blasting process, sand and scale removed from the casting (hereinafter referred to as “projection material etc.”) are guided to the bucket elevator 13.
- the bucket elevator 13 conveys the projection material and the like above the blasting apparatus 1 and supplies it to the separator 14.
- a punching metal 18 is disposed between the bucket elevator 13 and the separator 14. Thereby, the blasting apparatus 1 can remove a big burr
- the bucket elevator 13 is provided with a shot replenishing port 13a, and the blasting device 1 can replenish the projection material.
- the separator 14 is connected to the dust collector 15 and the hopper 11.
- the separator 14 is a wind selective type.
- the separator 14 drops the projection material or the like into an apron, and applies the airflow of a predetermined wind speed and air volume generated by suction by the dust collector 15 from the direction perpendicular to the falling direction, so that the sand, scale, and pulverized fine particles The right projection material.
- the selected sand, scale and pulverized fine projection material are collected by the dust collector 15 and discharged out of the apparatus.
- the wind speed / air volume of the airflow applied to the projection material or the like can be controlled by the opening degree of the damper 19 provided between the dust collector 15 and the separator 14. Thereby, the blast apparatus 1 can adjust classification accuracy, and can form and maintain the operating mix mentioned later.
- the projection material effective for the cleaning is supplied again to the hopper 11 and is circulated.
- the amount of the projection material in the apparatus decreases by the amount discharged to the outside of the blast apparatus 1, it is necessary to replenish the amount of projection material corresponding to the decrease amount.
- the decrease in the projection material is detected by the load current value of the impeller 12, and a new projection material is supplied from the shot supply port 13a.
- a control device is a computer including a CPU, a ROM, a RAM, and the like, and controls the configuration requirements of the blast device 1 described above.
- Drawing 2 is an explanatory view showing the process of the cleaning method concerning an embodiment.
- the blasting apparatus 1 is activated, and in step S1, a projection material loading process is performed.
- a projection material loading process is performed.
- unused blasting material is loaded into the blasting apparatus 1 from the shot supply port 13a.
- the projection material will be described later.
- step S2 an operating mix formation process is performed.
- the particle size distribution of the projection material in the blasting apparatus 1 is the same as the particle size distribution of the unused projection material.
- This state of stable particle size distribution is called operating mix. It is important that the projection material is managed so that the particle size distribution of the projection material in the apparatus after forming the operating mix can be efficiently polished.
- step S2 the characteristic distribution in which the particle size distribution in the blasting apparatus after forming the operating mix satisfies (the ratio of the first particles) ⁇ (the ratio of the second particles) ⁇ (the ratio of the third particles). It is controlled to become.
- the projection material is classified into a first particle having a particle diameter of 1.18 mm, a second particle having a particle diameter of 1.18 mm or less and exceeding 0.85 mm, and a third particle having a particle diameter of 0.85 mm or less. is doing. Even if the particle size distribution is controlled so that the ratio of the first particles is 60% by weight or more, the ratio of the second particles is 5 to 30% by weight, and the ratio of the third particles is 20% by weight or less. Good.
- This particle size distribution was compared with the particle size distribution according to “ECONOMICAL AND FUNCTIONAL ASPECTS OF BLAST CLEANING ABRASIVES BLASTING THEORY” (published by WHEEL ABRATOR, 1972), which was conventionally used as a guideline for the operating mix in polishing of castings.
- the comparison results are shown in Table 1.
- the “third particle” in the present embodiment is a mixture obtained by mixing the third and fourth particles of the conventional pointer in Table 1.
- the particle size distribution of the projection material of the present embodiment has a characteristic distribution that contains a large amount of the first particles having a large scouring force than the conventional projection material. Show.
- the first grain has a high scouring force and is particularly effective for removing a strong scale layer in the outermost layer of the casting.
- the polishing time can be shortened by increasing the number of first particles compared to the conventional projection material.
- the amount of the second granule is the same as that of the conventional one, and thereby the coverage can be ensured.
- the third granule has a low scouring force and cannot effectively remove the scale, so it was reduced compared to the conventional projection material. Moreover, since the 3rd granule contains foundry sand and mixing of foundry sand can be suppressed by reducing a 3rd granule, the abrasion of the components which comprise a blasting apparatus can be suppressed.
- FIG. 3 is an explanatory diagram showing an operating mix formation step (step S2).
- step S21 a dummy work made of, for example, the same material as that of a casting is prepared.
- step S22 the blasting apparatus 1 is activated, and the dummy work is the same as in the polishing of the casting.
- a projective material is projected according to conditions, and a series of operations for repeatedly discharging and replenishing fine powder outside the apparatus is performed.
- the particle size distribution of the projection material in the blast apparatus 1 becomes a particle size distribution different from the particle size distribution of the unused projection material.
- the projecting material may be blanked without using a dummy workpiece.
- step S23 the same determination as in step S5 described later is performed.
- the process proceeds to step S25, and then returns to step S23. If the projection material is not replenished, the process proceeds to step S24.
- step S24 it is determined whether or not the projection time has reached an equivalent time set in advance to form an operating mix. If the projection time has reached the equivalent time, the process proceeds to step S26, and if not, the process returns to step S23.
- step S26 the projection material is sampled, the particle size distribution is measured, and it is evaluated whether a desired operating mix is formed.
- the projection material can be sampled from the cut gate 11 b, the bucket elevator 13, and the separator 14. If it is determined that a desired operating mix has been formed (step S26: YES), the process proceeds to step S27, and the projection is terminated in step S27. Next, the dummy workpiece is collected in step S28, and the process proceeds to step S30.
- FIG. 4 is an explanatory diagram showing changes in the particle size distribution during the operating mix formation process.
- the particle diameter on the horizontal axis shows the lower limit value of the particle diameter section as a representative value.
- the projection material that showed the particle size distribution of (A) in an unused state has a reduced weight fraction of the first granules and increased particles below the second granules. To go. This is because the first particles are pulverized and reduced, and the second particles and the like are generated.
- the weight fraction of the first granules further decreases, and the particles below the second granules increase.
- the third and lower particles are discharged out of the machine by the separator 14, and the increase is suppressed. Moreover, since the first granule is replenished as much as the initial shot corresponds to the discharge amount, the decrease is suppressed. Therefore, the ratio of the 1st grain object, the 2nd grain object, and the 3rd grain object is stabilized in the state of (C).
- step S26 NO
- the process proceeds to step S29, the opening degree of the damper 19 is adjusted, and then the process returns to step S22.
- step S29 for example, when there are many small-diameter particles, it is possible to remove the particles by increasing the opening of the damper 19 and increasing the air volume.
- step S30 a test piece similar to a casting to be blasted is set on the blasting apparatus 1, and in a subsequent step S31, a blasting material is projected under the same conditions as in the case of blasting the casting to perform blasting.
- Steps S32 and S34 perform similar processing corresponding to steps S23 and S25, respectively.
- step S34 it is determined whether or not a preset time set in advance for polishing the casting has been reached. If the projection time has reached the set time, the process proceeds to step S35, and the projection of the projection material is terminated. If not, the process returns to step S5.
- step S36 following step S35, the test piece is collected, and the process proceeds to step S37.
- step S37 it is determined whether the test piece is properly polished. If it is determined that the scouring state is appropriate (step S37: YES), the process proceeds to step S3. If it is determined that the sharpening state is not appropriate (step S37: NO), the process proceeds to step S38, the projection conditions (projection time, projection speed, etc.) are changed, and then the process returns to step S30.
- step S23 and step S32 instead of the determination in step S23 and step S32, it can be determined by the amount of the projection material discharged outside the apparatus. Further, the projection material can be replenished every predetermined time without making a determination. Further, it is possible to cope with this by extending the projection time without adjusting the damper in step S29.
- Each process may be automatic or manual. When each process is automatically performed, each process is performed by the control device.
- step S3 the casting to be polished is placed on the workpiece mounting table 17 in the projection chamber 16, and the projection surface is projected in a state in which the operating mix is formed in step S4, thereby cleaning the casting surface. (Scouring process).
- step S5 it is determined whether or not to replenish the projection material based on the load current value of the ammeter of the impeller 12 that is projecting the projection material. If the load current value is larger than the preset current value and less than or equal to the predetermined fluctuation value, it is determined that the projection material is not replenished, and the process proceeds to step S6. When the load current value is equal to or less than the preset current value or exceeds a predetermined fluctuation value, it is determined that the projection material is replenished, and the process proceeds to step S7. In step S7, a predetermined amount of new projection material is supplied from the shot supply port 13a, and the process returns to step S5. The projection material is replenished by a predetermined amount set in consideration of the load of the bucket elevator and the like. Thereby, a desired operating mix can be maintained.
- step S6 it is determined whether or not the projection time has reached a preset time set in order to polish the casting. If the projection time has reached the set time, the process proceeds to step S8, and if not, the process returns to step S5. And projection is complete
- step S10 the casting subjected to the blasting treatment for a predetermined time is taken out from the blasting apparatus 1, and the blasting state is evaluated by visual observation or the like to determine whether or not the blasting of the casting is completed.
- step S10: pass the process proceeds to step S11.
- step S10: failed the polishing of the casting is not completed.
- step S11 it is determined whether or not to continue the polishing process. If there is no next workpiece, the series of operations is terminated, and if there is a next workpiece, the operations in step S3 and subsequent steps are repeated.
- the particle size distribution of the projection material after forming the operating mix can be made a distribution suitable for blasting of castings. Both can be improved.
- the projectile is a shot selected from the range of Vickers hardness HV300-600.
- the material and shape can be selected as appropriate, but in this embodiment, a spherical shot made of an iron-based material is used.
- the iron-based material for example, C: 0.8 to 1.2% by weight, Mn: 0.35 to 1.20% by weight, Si: 0.40 to 1.50% by weight, P ⁇ 0.
- a component system containing 05 wt%, S ⁇ 0.05 wt%, the balance Fe and inevitable impurities, and having a tempered martensite structure or a similar structure can be employed.
- Such particles can be prepared by a known method such as a water atomizing method.
- the projection material has sufficient hardness for the object to be cleaned at HV300 or more, and the projection material has sufficient toughness at HV600 or less.
- the projection material of this embodiment has sufficient hardness and toughness, it can be used suitably for the polishing of the casting surface.
- Vickers hardness HV is based on Japanese Industrial Standard JIS Z 2244 (2009).
- FIG. 5 is a schematic diagram of a particle size distribution of a projection material as an example that can be used in the polishing method according to the embodiment.
- the particle diameter on the horizontal axis shows the lower limit value of the particle diameter section as a representative value.
- the particle diameter d of the projection material is 0.85 mm ⁇ d ⁇ 2.36 mm, and the distribution of the particle diameter d of the projection material is a particle diameter section 1.18 mm ⁇ d ⁇ 1.40 mm in the frequency distribution (JIS G 5904).
- the frequency of the particle diameter section 1.70 mm ⁇ d ⁇ 2.00 mm is 0.4 to 1.0 times the frequency, and the particle diameter section 1.40 mm ⁇ d ⁇ 1. Adjustment is made so that the frequency of 70 mm is 0.2 to 0.7 times.
- the measuring method of the particle size distribution is based on Japanese Industrial Standard JIS G 5904 (1966) and is shown by weight distribution.
- the distribution of the particle diameter d of the projection material is, for example, such that the frequency of the particle diameter section 1.70 mm ⁇ d ⁇ 2.00 mm is 0.6 to 0 with respect to the frequency of the particle diameter section 1.18 mm ⁇ d ⁇ 1.40 mm. And the frequency is adjusted so that the frequency of the particle diameter section 1.40 mm ⁇ d ⁇ 1.70 mm is 0.3 to 0.6 times. According to this, the scouring force and the scouring efficiency can be further improved, and it can be suitably used for scouring a casting.
- the projection material having such a particle size distribution is a first projection material in which the particle diameter d is 1.18 mm ⁇ d ⁇ 2.36 mm and the frequency of the particle diameter section 1.70 mm ⁇ d ⁇ 2.00 mm is maximized. And a second projection material in which the particle diameter d is 0.85 mm ⁇ d ⁇ 1.40 mm and the frequency of the particle diameter section 1.18 mm ⁇ d ⁇ 1.40 mm is maximized. it can. That is, the projection material is a mixture of the first projection material and the second projection material.
- the polishing force can be increased.
- the coverage actual dent of the projection material per fixed area
- the second projection material can improve the coverage, but has a low blasting force against a particularly strong sand scale as compared with the first projection material. Therefore, although it has a sufficient blasting force for removing the foundry sand and scale, the scouring force is insufficient to remove seizure and the like generated on the surface of the foundry sand, and the blasting time becomes longer.
- the projection material according to the present embodiment by mixing these projection materials so as to have the particle size distribution described above, it is possible to maintain the respective advantages and supplement the portion where the scouring ability is insufficient.
- the sharpening force can be improved by the first projecting material, and the coverage can be improved by the second projecting material. That is, it is possible to perform the cleaning with both the cleaning force and the cleaning efficiency improved.
- the particle size distribution can be made substantially continuous. Therefore, since the size of the dent by the blast has a continuous distribution, the coverage can be increased and the blast can be efficiently performed.
- the first projection material and the second projection material are classified by using a sieve having a mesh size of 0.85 to 2.36 mm as defined in JIS Z 8801 (2006), by using a known method such as a water atomizing method. It can be prepared by mixing and adjusting to obtain a desired particle size distribution.
- the particle size distribution in the blasting apparatus after forming the operating mix can be set to the above-mentioned distribution suitable for the polishing of the casting, without using a special apparatus or method.
- the projection material replenished in steps S25, S34, and S7 may be different from the projection material loaded in step S1.
- a large diameter projection material can be supplied to form a desired operating mix.
- the form of the projection material is not limited to shots, and grit, cut wires, and the like can also be used.
- the 1st projection material and the 2nd projection material are good also as the same material, and may form with the material from which hardness differs.
- the particle size distribution of the projection material after the formation of the operating mix contains a large amount of the first particles having a large polishing force, and the second particles are used in order to ensure coverage. Then, the distribution is a characteristic distribution in which the number of third particles containing a large amount and having a low scouring force is reduced.
- the first grain can improve the scouring force and shorten the scouring time, and the second grain can secure the coverage, thus improving both the scouring force and the scouring efficiency. It is possible to realize a polishing method for cast castings.
- the workpiece used in this example was made of FC250, poured at a pouring temperature of 1350 ° C., unpacked for 30 min after pouring, and cooled at a cooling rate of 3 ° C./min.
- the product weight is about 3.5 kg.
- the projection test apparatus used for the test was a shot blast SNTX-I type (Shinto Kogyo Co., Ltd.), and the projection speed was 73 m / s and the table rotation speed was 6 rpm.
- ⁇ Derusting degree increased with the projection density. Further, the degree of rust removal increased as the particle size increased, but a tendency to be almost saturated at a particle size of 1.18 mm was observed. Thereby, in order to obtain a large scouring force, it is sufficient that the particle diameter is 1.18 mm or more, and considering the coverage, it is understood that the particle diameter may be 1.18 mm.
- the degree of rust removal at a particle size of 1.18 mm was about 70% even when the projection density was 300 kg / m 2 . This is because there is no particle having a particle diameter of 1.0 mm or less, that is, the second particle is not included, and thus the coverage does not increase.
- the particle size distribution after the formation of the operating mix is effective in obtaining a large scouring force by the first granules, shortening the scouring time, and improving the coverage by the second granules.
- the projection material to be used for the test is a first projection material adjusted so that the particle diameter d is 1.18 mm ⁇ d ⁇ 2.36 mm and the frequency of the particle diameter section 1.70 mm ⁇ d ⁇ 2.00 mm is maximized.
- a second projection material adjusted so that the particle diameter d is 0.850 mm ⁇ d ⁇ 1.40 mm and the frequency of the particle diameter section 1.18 mm ⁇ d ⁇ 1.40 mm is maximized,
- the hardness is HV450.
- FIG. 7 shows the particle size distribution.
- FIG. 7 is an explanatory diagram showing the particle size distribution of the projection material of the example. This particle size distribution satisfied the exemplified conditions for the particle size distribution of the projection material.
- a test with a steel shot having a diameter of 1.7 mm was also performed.
- the projection density was 150 to 300 kg / m 2 .
- the projection material was put into a projection test apparatus, and after performing continuous operation and replenishment to form an operating mix, a projection test was performed.
- the particle size distribution after forming the operating mix is 76% by weight of the first particles, 20% by weight of the second particles, and 4% by weight of the third particles, satisfying the particle size distribution of the present embodiment.
- FIG. 8 is an explanatory view showing the surface state of the sample after the blast test.
- the convex and concave portions and character portions (engraved portions) were enlarged to observe the finished state, and visual evaluation was performed. Details of visual appearance are summarized in FIG.
- FIG. 9 is a table for explaining the surface state shown in FIG. As shown in FIGS. 8 and 9, in the comparative example, it was confirmed that a scale exists in the dotted line area surrounded by the dotted line in the range of the projection density of 150 kg / m 2 to 250 kg / m 2 . The scale was removed at a projection density of 300 kg / m 2 .
- a projection density of 300 kg / m 2 was required to finish.
- a scale exists in a dotted line region surrounded by a dotted line when the projection density is in a range of 150 kg / m 2 to 200 kg / m 2 .
- the scale was removed at a projection density of 250 kg / m 2 .
- the working example was finished at a projection density of 250 kg / m 2 .
- FIG. 10 is an explanatory diagram showing the measurement results of the degree of rust removal of the sample after the blast test. As the projection density increased, the degree of rust removal increased. A degree of rust removal of 90% or more corresponds to the finished point of visual appearance evaluation. In the example, it was confirmed that an equivalent finish could be realized in a state where the projection density was 17% lower than that of the comparative example, and the polishing time could be shortened.
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Abstract
Description
ステップS25、S34、S7で補給する投射材はステップS1で装填する投射材と異なるものを用いることもできる。例えば、大径の投射材のみを補給して、所望のオペレーティングミックスを形成することもできる。また、投射材の形態はショットに限定されるものではなく、グリット、カットワイヤなどを用いることもできる。そして、第1投射材と第2投射材は、同じ材質としてもよいし、硬度が異なる材質で形成してもよい。
実施形態に係る研掃方法によれば、オペレーティングミックス形成後の投射材の粒子径分布を、研掃力が大きい第1粒体を多量に含有し、カバレージを確保するために第2粒体をそれに次いで多く含み、研掃力が低い第3粒体を少なくするという特徴的な分布とする。これにより、第1粒体により研掃力を向上させて研掃時間を短縮することができ、第2粒体によりカバレージを確保することができるので、研掃力と研掃効率とをともに向上させた鋳物の研掃方法を実現することができる。
粒子径0.36、0.60、0.85、1.00,1.18、1.40、1.70、2.00mmのスチールショット(HV450)を用いて、投射密度と除錆度との関係を調べた。投射密度は被加工物の単位面積当たりに投射された投射材の累積量を示し、投射時間に対応する。除錆度は、試料表面を20倍で拡大撮影した後に、錆の除去割合を図積分して測定した標準写真と対比して求めた。図6に結果を示す。図6は、粒子径の除錆度への影響を調べた結果について説明する図である。
本試験に使用した被加工物及び投射条件は、前述の「(1)オペレーティングミックス形成後の投射材の粒子径の影響」と同様である。
Claims (3)
- ブラスト装置により鋳物の表面に投射材を投射する鋳物の研掃方法であって、
前記投射材はビッカース硬度がHV300~600の範囲の投射材であり、未使用の投射材を前記ブラスト装置に装填する投射材装填工程と、
前記ブラスト装置の操業により投射材の粒子径分布を一定の粒子径分布が安定するオペレーティングミックスを形成するオペレーティングミックス形成工程と、
前記オペレーティングミックス形成工程後の投射材を鋳物の表面に投射する研掃工程と、
を備え、
前記オペレーティングミックス形成工程後の投射材の粒子径分布が、粒子径1.18mmを超える第1粒体と、粒子径1.18mm以下で0.85mmを超える第2粒体と、粒子径0.85mm以下の第3粒体と、に区分したときに、(第1粒体の比率)≧(第2粒体の比率)≧(第3粒体の比率)を充足する、
鋳物の研掃方法。 - 第1粒体の比率は60重量%以上、第2粒体の比率は5~30重量%、第3粒体の比率は20重量%以下である請求項1に記載の鋳物の研掃方法。
- 前記未使用の投射材は、粒子径dが1.18mm<d≦2.36mmであって粒子径区間1.70mm<d≦2.00mmの頻度が最大となる第1投射材と、粒子径dが0.85mm<d≦1.40mmであって粒子径区間1.18mm<d≦1.40mmの頻度が最大となる第2投射材との混合物である請求項1又は2に記載の鋳物の研掃方法。
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WO2019146529A1 (ja) * | 2018-01-25 | 2019-08-01 | 新東工業株式会社 | 投射材及びブラスト処理方法 |
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