Abstract

A composite cast tool is cast in one continuous piece, partly of steel and party of grey iron, so that an interconnection zone (7) is formed between the steel and the grey iron. The steel portion (10) forms the working component of the tool, for example a cutting edge, and the grey iron portion (11) forms the body component of the tool. The steel portion and the grey iron portion have projections or walls (8, 9, respectively) extending towards one another. The interconnection zone (7) is located in the region of union between these walls and is planar.

IPC Classes  ?

• B21D 37/20 - Making tools by operations not covered a single other subclass
• B21D 37/01 - Selection of materials
• B22D 19/06 - Casting in, on, or around, objects which form part of the product for manufacturing or repairing tools
• B22D 19/16 - Casting in, on, or around, objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills

Abstract

A mould for casting in one piece of a tool with a working component of steel and a body of grey iron with an interconnection zone there between has a first model section (2) corresponding to the working component and a second model section (3) corresponding to the body. The model sections are in contact with one another along a contact plane (4) which is horizontal and planar and which represents the interconnection zone. In a method for producing a mould for one piece casting of a tool with a working component of steel and a body of grey iron with an interconnection zone therebetween, a first model section (2) is produced corresponding to the steel and a second model section corresponding to the grey iron. The model sections are brought into contact with one another with the contact surface horizontally aligned and with the first model section (2) lowermost.

IPC Classes  ?

• B22D 19/16 - Casting in, on, or around, objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
• B22C 7/02 - Lost patterns
• B22D 19/06 - Casting in, on, or around, objects which form part of the product for manufacturing or repairing tools

Abstract

A method of one-piece casting of a tool with a working component (18) of steel and a body (19) of grey iron, and an interconnection zone therebetween is carried out in a single mould (2) which is kept closed and unchanged during the casting. The steel is cast first from beneath and upwards, whereafter a pause is made. The casting of the grey iron is only carried out when the temperature of the steel in the intended interconnection zone (8) has fallen to a temperature corresponding to the liquidus temperature of the steel minus approx. 30° to 150°C.

IPC Classes  ?

• B22D 19/16 - Casting in, on, or around, objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
• B21D 37/20 - Making tools by operations not covered a single other subclass
• B22D 19/06 - Casting in, on, or around, objects which form part of the product for manufacturing or repairing tools

Abstract

A mould for one piece casting of a tool, which has a working component (17) of steel and a body (18) of grey iron has a first mould cavity section (4) for the steel and a second mould cavity section (5) for the grey iron, with an interconnection zone therebetween. A dividing plane (3) between the sections (4, 5) is planar and horizontal and located at the interconnection zone. A duct (12) leads from the first section (4) to an accommodation space (11) for possible surplus of steel. In a method for one piece casting of a tool, which has a working component (18) of steel and a body (18) of grey iron with an interconnection zone therebetween, the steel is cast in a first mould cavity section (4) and the grey iron in a second mould cavity section (5). A dividing plane (3) between the mould cavity sections is planar and horizontal. An accommodation space (11) for surplus of steel is provided to permit steel to flow from the first mould cavity section (4) at the level of the dividing plane (3) into the accommodation space.

IPC Classes  ?

• B22D 19/16 - Casting in, on, or around, objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
• B21D 37/20 - Making tools by operations not covered a single other subclass
• B22D 19/06 - Casting in, on, or around, objects which form part of the product for manufacturing or repairing tools