A blast-cleaning method for a casting product
A shot blasting cleaning and casting technology, which is applied to used abrasive processing devices, manufacturing tools, abrasives, etc., can solve the problem of not finding projecting materials, and achieve the goal of improving shot blasting cleaning force and improving shot blasting cleaning efficiency. Effect
Active Publication Date: 2017-08-01
SINTOKOGIO LTD
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Problems solved by technology
Therefore, although the particle size and hardness can be appropriately selected according to the application, there is no projection material with the particle size distribution adjusted specifically for shot blasting of castings.
In addition, in Non-Patent Document 1, the recommended particle size distribution after the formation of the mixed state of the shot blasting operation of the casting is shown, but it is necessary to use a projection material with greater blast cleaning force and higher shot blast cleaning efficiency. Shot blasting method
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[0073] Hereinafter, examples performed to confirm the effects of the present invention will be described. The workpiece used in this example is obtained by setting the material as FC250, pouring at a pouring temperature of 1350°C, dividing into boxes 30 minutes after pouring, and cooling at a cooling rate of 3°C / min. Product weight is about 3.5kg. The projection test apparatus used for the test was a shot peening SNTX-I type (Shinto Kogyo Co., Ltd.), and it was carried out at a projection speed of 73 m / s and a table rotation speed of 6 rpm.
[0074] (1) Influence of the particle size of the projection material after the operation mixed state is formed
[0075] Steel particles (HV450) with particle sizes of 0.36mm, 0.60mm, 0.85mm, 1.00mm, 1.18mm, 1.40mm, 1.70mm, and 2.00mm were used, and the relationship between projected density and derusting degree was investigated. The shot density represents the cumulative amount of projected material per unit area projected on the workpi...
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Abstract
A blast-cleaning method for a casting product is a method of discharging a projectile material at a surface of a casting product by using a blasting device. The projectile material has a Vickers hardness (JIS Z 2244) in the range of HV300-600. After performing an operating mix formation step for forming an operating mix in which the particle diameter distribution of the projectile material is stable at a constant particle diameter distribution, the projectile material particle diameter distribution satisfies the equation: (proportion of first particles)>=(proportion of second particles)>=(proportion of third particles), when classifying first particles as those having a particle diameter exceeding 1.18 mm, second particles as those having a particle diameter no greater than 1.18 mm and greater than 0.85 mm, and third particles as those having a particle diameter no greater than 0.85 mm; and the blast-cleaning is performed by projecting the projectile material having the particle diameter distribution by operating the blasting device.
Description
technical field [0001] The present invention relates to a shot blasting method for removing scales such as molding sand attached to the surface of a casting after casting and rust formed on the surface of a base material by sandblasting. Background technique [0002] Conventionally, in order to perform shot blasting to remove scales such as molding sand adhering to the surface after casting and rust formed on the surface of the base material on the casting, shot blasting is performed by projecting hard particles on the casting. Shot blasting of such castings is often performed using spherical particles made of steel (for example, refer to Patent Document 1). [0003] In addition, in the operation of the sandblasting device, when a predetermined amount of projectile material is put into the sandblasting device and the casting is blasted, the cycle of projecting, collecting, removing fine powder, and projecting is repeated for the projectile material. When the projection is r...
Claims
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IPC IPC(8): B24C11/00B24C9/00
CPCB24C9/00B24C11/00B22D31/002
Inventor 横山达朗后藤贤
Owner SINTOKOGIO LTD