A method and apparatus for manufacturing an equiaxed crystal aluminum alloy cast ingot by using additive manufacturing and rapid solidification techniques are provided. The apparatus comprises: a metal heating mechanism and a negative pressure cooling mechanism. The metal heating mechanism is located above the negative pressure cooling mechanism and is connected thereto by a nozzle. The negative pressure cooling mechanism comprises a vacuum chamber having an air inlet hole and an air outlet hole, and a three-dimensional moving ingot mechanism disposed inside the vacuum chamber. The three-dimensional moving ingot mechanism comprises a moving ingot and a two-dimensional moving platform vertically connected to the moving ingot. A water cooling mechanism is disposed outside the moving ingot, and the moving ingot is driven by a precision motor to precisely move up and down.

The present disclosure provides downhole tools, methods for three dimensional printing hardfacing on such downhole tools, and systems for implementing such methods.

The present disclosure provides downhole tools, methods for three dimensional printing hardfacing on such downhole tools, and systems for implementing such methods.

A method including depositing a first material on a first member by an additive manufacturing process in a pattern intended to aid in an assembly of the first member and at least a second member and inserting the first member at least partially into the second member, with the first material being guide for insertion.

A method including depositing a first material on a first member by an additive manufacturing process in a pattern intended to aid in an assembly of the first member and at least a second member and inserting the first member at least partially into the second member, with the first material being guide for insertion.

A plasticizing apparatus for plasticizing a material to form a molten material includes a screw in a columnar shape having a groove formed face, in which a material flow channel including a groove portion to be supplied with the material is formed, and a barrel having a screw opposed face, which is a face opposed to the groove formed face, and in which a sending-out hole for sending out the molten material is formed at a center, and a heating portion heating the material. The material flow channel has a recess provided at a center of the groove formed face, and the groove portion extending in a spiral shape toward an outer circumference of the groove formed face from the recess, and a heat insulating portion having a lower thermal conductivity than an outer circumferential portion in the screw is provided in at least a part of an inner circumferential portion including the recess in the screw.

A plasticizing apparatus for plasticizing a material to form a molten material includes a screw in a columnar shape having a groove formed face, in which a material flow channel including a groove portion to be supplied with the material is formed, and a barrel having a screw opposed face, which is a face opposed to the groove formed face, and in which a sending-out hole for sending out the molten material is formed at a center, and a heating portion heating the material. The material flow channel has a recess provided at a center of the groove formed face, and the groove portion extending in a spiral shape toward an outer circumference of the groove formed face from the recess, and a heat insulating portion having a lower thermal conductivity than an outer circumferential portion in the screw is provided in at least a part of an inner circumferential portion including the recess in the screw.

A method operates a three-dimensional (3D) metal object manufacturing system to compensate for errors that occur during object formation. In the method, thermal image data and dimensional image data of a metal object being formed by the 3D metal object manufacturing system is generated prior to completion of the metal object. Thermal conditions are identified from these data and compared to predetermined ranges corresponding to the identified thermal conditions to identify one or more errors. For identified errors outside a corresponding predetermined difference range, the method performs an error compensation technique. The error compensation includes modification of a surface data model, modification of machine-ready instructions, or operation of a subtractive device.

A method operates a three-dimensional (3D) metal object manufacturing system to compensate for errors that occur during object formation. In the method, thermal image data and dimensional image data of a metal object being formed by the 3D metal object manufacturing system is generated prior to completion of the metal object. Thermal conditions are identified from these data and compared to predetermined ranges corresponding to the identified thermal conditions to identify one or more errors. For identified errors outside a corresponding predetermined difference range, the method performs an error compensation technique. The error compensation includes modification of a surface data model, modification of machine-ready instructions, or operation of a subtractive device.

Disclosed is a three-dimensional printing method for instantly generating a needed molten raw material by way of a resistance heating function during three-dimensional printing. The method can realize three-dimensional printing of material having a high melting point and falls within the technical field of additive manufacturing. The method is characterized by applying a current through a solid raw material and a body to be printed; partially or fully heating the solid raw material located between a guiding device and said body to be printed into a molten state by way of resistance heating; and generating a molten raw material in a space located between the guiding device and the body to be printed. During the accumulation of the molten raw material, an area of the body to be printed and where the molten raw material is to be accumulated and/or is being accumulated is heated; or, the body to be printed is heated; or, the area of the body to be printed and where the molten raw material is to be accumulated and/or is being accumulated is heated, and the body to be printed is heated.