US 6,718,813 B2 · Pipe rack forming method and apparatus

Abstract

In a pipe rack forming method, in a state of holding a pipe forming body by a holding portion in a holding metal mold, at a time of pressing a flat surface portion of the pipe forming body by tooth bottom forming surfaces of respective stages of tooth profile portions in a tooth profile metal mold, the structure is made such as to sequentially employ the tooth profile portions in which a tooth bottom height applied to the flat surface portion is reduced in sequence for the tooth profile portions in the tooth profile metal mold, repeatedly pressing and moving forward and backward mandrels having the same size to an inner periphery of the pipe forming body every time when the respective stages of tooth profile portions in the tooth profile metal mold press the flat surface portion, and forming a rack tooth having a final tooth profile.

Claims11

Dependent claims

A pipe rack forming method of forming a rack tooth having a final tooth profile of a fixed tooth bottom height and tooth top height, in a part of a pipe material comprising:

preparing a tooth profile metal mold having a plurality of tooth profile portions each having a different height position of tooth bottom forming surfaces;
holding a raw pipe material by a holding portion of a holding metal mold,
sequentially pressing the tooth profile portions in which the tooth bottom height applied to a part of the raw pipe material is reduced in sequence
repeatedly pressing and a moving forward and backward a mandrel, the mandrel having the same size every time, to an inner periphery of the raw pipe material when the tooth profile portions in the tooth profile metal mold press a part of the raw pipe material, and
forming a rack tooth having a final tooth profile.

2 more elements

A pipe rack forming method of forming a rack tooth having a final tooth profile of a fixed tooth bottom height and tooth top height, in a part of a raw pipe material comprising:

using a tooth profile metal mold in which a tooth profile portion capable of being displaced with respect to a tooth profile metal mold main body, and a height position of a tooth bottom forming surface in the tooth profile portion is capable of being controlled,
holding a raw pipe material by a holding portion of a holding metal mold and the tooth profile metal mold body,
pressing a part of the raw pipe material by the tooth bottom forming surface of the tooth profile portion in the tooth profile metal mold,
position controlling the tooth profile portion so that the tooth bottom height applied to a part of the raw pipe material is reduced in sequence,
repeatedly pressing and moving forward and backward a mandrel, the mandrel having the same size every time, to an inner periphery of the raw pipe material when the tooth profile portion in the tooth profile metal mold presses the part of the raw pipe material, and
forming a rack tooth having a final tooth profile.

3 more elements

A pipe rack forming method of forming a rack tooth having a final tooth profile of a fixed tooth bottom height and tooth top height, in a part of a raw pipe material comprising:

using a tooth profile metal mold in which a tooth profile portion capable of being displaced with respect to a tooth profile metal mold main body, and a height position of a tooth bottom forming surface in the tooth profile portion is capable of being controlled,
holding a raw pipe material by a holding portion of a holding metal mold and the tooth profile metal mold body,
pressing a part of the raw pipe material by the tooth bottom forming surface of the tooth profile portion in the tooth profile metal mold,
position controlling the tooth profile portion so that the tooth bottom height applied to a part of the raw pipe material by is reduced in sequence,
alternatively repeating an operation of moving forward in a pressing state and moving backward in a pressing state a mandrel, the mandrel having the same size every time, to an inner periphery of the raw pipe material when the tooth profile portion in the tooth profile metal mold presses the part of the raw pipe material, and
forming a rack tooth having a final tooth profile.

3 more elements

Dependencies are inferred from the claim text.

Pipe rack forming method and apparatus

Life of this patent

Pipe rack forming method and apparatus

Life of this patent

Abstract

Claims11