Device and method for drawing metal tube

A device for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising a control unit configured to:

• initiate a measurement of an elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped;
• control to stop an operation of the device when a measuring elapsed time exceeds a preset allowed time during a period of time from an initiation of the measurement until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn, or at a time at which it becomes ready to be drawn;
• and
• control to initiate drawing when the measuring elapsed time is within the preset allowed time at a time at which the metal blank tube is set at the pulling position between the die and the plug and becomes ready to be drawn.

A device for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising a control unit configured to:

• measure a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped until the plug is inserted into the metal blank tube;
• control to stop an operation of the device when the measured first elapsed time exceeds a preset first allowed time;
• and
• control to continue an operation of the device when the measured first elapsed time is within the preset first allowed time,
• wherein the control unit is configured to:
• also measure a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn;
• control to not perform drawing of the metal blank tube when the measured second elapsed time exceeds a preset second allowed time;
• and
• control to initiate drawing when the measured second elapsed time is within the preset second allowed time.

A device for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising a control unit configured to:

• measure a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped until the plug is inserted into the metal blank tube;
• control to stop an operation of the device when the measured first elapsed time exceeds a preset first allowed time;
• and
• control to continue an operation of the device when the measured first elapsed time is within the preset first allowed time,
• wherein the control unit is configured to:
• measure a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube;
• control to stop the operation of the device when the measuring second elapsed time exceeds a preset second allowed time during a period of time from an initiation of the measurement until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn, or at a time at which it becomes ready to be drawn;
• and
• control to initiate drawing when the measuring second elapsed time is within the preset second allowed time at a time at which the metal blank tube is set at a pulling position between the die and the plug and becomes ready to be drawn.

A device for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising a control unit configured to:

• initiate a measurement of a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped;
• control to stop an operation of the device when the measuring first elapsed time exceeds a preset first allowed time during a period of time from an initiation of the measurement until the plug is inserted into the metal blank tube, or at a time at which the plug is inserted;
• and
• control to continue the operation of the device when the measuring first elapsed time is within the preset first allowed time at a time at which the plug is inserted into the metal blank tube,
• wherein the control unit is configured to:
• also measure a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn;
• control to not perform drawing of the metal blank tube when the measured second elapsed time exceeds a preset second elapsed time;
• and
• control to initiate drawing when the measured second elapsed time is within the second allowed time.

A device for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising a control unit configured to:

• initiate a measurement of a first elapsed time from a period of time at which supplying of a lubricating oil to a surface of the plug is stopped;
• control to stop an operation of the device when the measuring first elapsed time exceeds a preset first allowed time during a period of time from the initiation of the measurement until the plug is inserted into the metal blank tube, or at a time at which the plug is inserted;
• and
• control to continue the operation of the device when the measuring first elapsed time is within the preset first allowed time at a time at which the plug is inserted into the metal blank tube,
• wherein the control unit is configured to:
• initiate a measurement of a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube;
• control to stop the operation of the device when the measuring second elapsed time exceeds a preset second allowed time during a period of time from an initiation of the measurement until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn, or at a time at which it becomes ready to be drawn;
• and
• control to initiate drawing when the measuring second elapsed time is within the preset second allowed time at a time at which the metal blank tube is set at a pulling position between the die and the plug and becomes ready to be drawn.

A method for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping the supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug;
• wherein it is configured to:
• measure an elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn is measured;
• control to not perform drawing of the metal blank tube when the measured elapsed time exceeds a preset allowed time;
• and
• control to perform drawing of the metal blank tube when the measured elapsed time is within a preset allowed time.

A method for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping the supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug;
• wherein it is controlled to:
• initiate a measurement of an elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped;
• control to stop an operation of a device when a measuring elapsed time exceeds a preset allowed time during a period of time from an initiation of the measurement until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn, or at a time at which it becomes ready to be drawn;
• and
• control to perform drawing when the measuring elapsed time is within the preset allowed time at a time at which the metal blank tube is set at a pulling position between the die and the plug and becomes ready to be drawn.

A method for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug;
• wherein it is configured to:
• measure a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped until the plug is inserted into the metal blank tube;
• control to stop an operation of a device when the measured first elapsed time exceeds a preset first allowed time;
• and
• control to continue the operation of the device when the measured first elapsed time is within the preset first allowed time,
• measure a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn;
• control to not perform drawing of the metal blank tube when the measured second elapsed time exceeds a preset second allowed time;
• and
• control to perform drawing when the measured second elapsed time is within a preset second allowed time.

A method for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug;
• wherein it is configured to:
• measure a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped until the plug is inserted into the metal blank tube;
• control to stop an operation of a device when the measured first elapsed time exceeds a preset first allowed time;
• control to continue an operation of the device when the measured first elapsed time is within the preset first allowed time;
• initiate a measurement of a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube;
• control to stop the operation of the device when the measuring second elapsed time exceeds a preset second allowed time during a period of time from an initiation of the measurement until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn, or at a time at which it becomes ready to be drawn;
• and
• perform drawing when the measuring second elapsed time is within the preset second allowed time at a time at which the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn.

A method for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug;
• wherein it is configured to:
• initiate a measurement of a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped;
• control to stop an operation of a device when the measuring first elapsed time exceeds a preset first allowed time during a period of time from the initiation of the measurement until the plug is inserted into the metal blank tube, or at a time at which the plug is inserted;
• continue the operation of the device when the measuring first elapsed time is within the preset first allowed time at a time at which the plug is inserted into the metal blank tube;
• measure a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn;
• control to not perform drawing of the metal blank tube when the measured second elapsed time exceeds a preset second allowed time;
• and
• perform drawing when the measured second elapsed time is within the second allowed time.

A method for drawing a metal tube in which drawing is performed by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug,
• wherein it is configured to:
• initiate a measurement of a first elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped;
• control to stop an operation of a device when the measuring first elapsed time exceeds a preset first allowed time during a period of time from the initiation of the measurement until the plug is inserted into the metal blank tube, or at a time at which the plug is inserted;
• continue the operation of the device when the measuring first elapsed time is within the preset first allowed time at a time at which the plug is inserted into the metal blank tube;
• initiate a measurement of a second elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped or from a time at which the plug is inserted into the metal blank tube;
• control to stop the operation of the device when the measuring second elapsed time exceeds a preset second allowed time during a period of time from an initiation of the measurement until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn, or at a time at which it becomes ready to be drawn;
• and
• perform drawing when the measuring second elapsed time is within the preset second allowed time at a time at which the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn.

A method for producing a metal tube by performing drawing by making a metal blank tube pass through between a die for forming an outer surface and a plug for forming an inner surface, comprising:

• an application step for applying a lubricating oil to a surface of the plug and then stopping supplying of the lubricating oil;
• an insertion step for inserting and placing the plug to which the lubricating oil was applied into the metal blank tube;
• and
• a setting step for setting the metal blank tube at a drawing position between the die and the plug,
• wherein it is configured to:
• measure an elapsed time from a time at which supplying of a lubricating oil to a surface of the plug is stopped until the metal blank tube is set at a drawing position between the die and the plug and becomes ready to be drawn;
• control to not perform drawing of the metal blank tube when the measured elapsed time exceeds a preset elapsed time;
• and
• perform drawing of the metal blank tube when the measured elapsed time is within a preset allowed time.