Abstract: A control method by a computer, the control method acquires work information including information on work performed by a robot arm and information on an article as a target of the work; causes the robot arm to perform an operation of lifting up a predetermined unit of articles based on the work information; determines that there is a possibility that a plurality of articles are packaged together based on sensor data obtained when the operation is being performed; and when it is determined that there is a possibility that a plurality of articles are packaged together, settles a handling method for the article according to the sensor data.

Abstract: A control method includes: acquiring article information including a price of an article to be handled by a robot arm; deciding, based on the article information, a handling method of the article to be handled by the robot arm as a handling method in which as the price of the article is higher, damage prevention of the article is more prioritized; and controlling the robot arm that handles the article based on the handling method.

Abstract: Ejection material in powder form used in mechanical plating, each particle of the ejection material being made of an iron alloy core covered with a zinc alloy layer and conducted with thermal treatment at a temperature between 300.degree. and 700.degree. C. so that the zinc alloy layer has the Vicker's hardness of 60 to 370.

Abstract: Mechanical plating method for forming a zinc alloy film by ejecting powder onto a surface. Ejection powder is made by mixing iron or iron alloy nuclei with zinc alloy melt, cooling to form a solidified alloy, and crushing. The ejection powder is then heat treated between 300.degree. C. and 700.degree. C. to adjust the Vicker's hardness of the zinc alloy to between 60 and 370.

Abstract: A blast material for the mechanical plating and a continuous mechanical plating process. The blast material comprises up to 90% by weight of steel shot not less than 10% by weight of an alloy powder which comprises 2.5-50% by weight of iron, not more than 5% by weight of at least one of aluminum, copper, tin, magnesium and silicon, the balance being zinc, and has a maximum particle size of about 0.4 mm and an average hardness of 140-450 Hv., The continuous mechanical process comprises continuing blasting, recycling the used blast material and magnetically separating the abraded fine particles of the steel shot in the course of the recycling.

Abstract: A blast material for mechanical plating and a continuous mechanical plating process. The blast material comprises 60-90% by weight of steel shot and 10-40% by weight of a coating powder which is an alloy comprising 2.5-50% by weight of iron, not more than 5% by weight of aluminum, copper, tin, magnesium and silicon or a combination thereof and the balance being zinc. The powder has a maximum particle size of about 0.4 mm and an average hardness of 140-450 Hv. The continuous mechanical process comprises continuously blasting the blast material onto a metal part, recycling the used blast material and magnetically separating abraded fine particles of the steel shot in the course of the recycling.