A push-bending forming device for titanium alloy tubes is provided, which includes a die main body, a plurality of filling balls, a differential temperature assembly and a punch. The filling balls are configured to be filled in a tube blank, and are made of a metal material, with a heat-resistance temperature over 500 C. A diameter of the filling ball is less than an inner diameter of the tube blank. The punch includes a first pushing part and a second pushing part. A push-bending forming method using such device is also provided.

A method is disclosed for forming a curved portion with a small curvature radius in an original tube while suppressing wrinkles and buckling. The method includes placing the original tube between a first die and a second die, and pressing one or more times on the original tube by bringing the first die and the second die closer together and pressing the first die and second die against the original tube, wherein the original tube has a circular cross-sectional shape in at least a portion thereof, the first die has a first curved surface, the second die has a second curved surface, in one of the pressing, cross-sectioning and bending are simultaneously performed on at least the portion of the original tube by pressing the first die and second die against at least the portion of the original tube; in the cross-sectioning, the circular cross-sectional shape of the original tube is reduced in diameter, and a diameter reduction rate in one time of the pressing is more than 0% and less than 10%.

A method is disclosed for forming a curved portion with a small curvature radius in an original tube while suppressing wrinkles and buckling. The method includes placing the original tube between a first die and a second die, and pressing one or more times on the original tube by bringing the first die and the second die closer together and pressing the first die and second die against the original tube, wherein the original tube has a circular cross-sectional shape in at least a portion thereof, the first die has a first curved surface, the second die has a second curved surface, in one of the pressing, cross-sectioning and bending are simultaneously performed on at least the portion of the original tube by pressing the first die and second die against at least the portion of the original tube; in the cross-sectioning, the circular cross-sectional shape of the original tube is reduced in diameter, and a diameter reduction rate in one time of the pressing is more than 0% and less than 10%.

A push-bending forming device for titanium alloy tubes is provided, which includes a die main body, a plurality of filling balls, a differential temperature assembly and a punch. The filling balls are configured to be filled in a tube blank, and are made of a metal material, with a heat-resistance temperature over 500 C. A diameter of the filling ball is less than an inner diameter of the tube blank. The punch includes a first pushing part and a second pushing part. A push-bending forming method using such device is also provided.

A system for imposing a permanent bend in a length of tubing, includes a bend setting portion having surface, a groove extending inwardly of the surface, the groove having a dimension which is smaller than an outer dimension of a tubing to be bent therein a fixing element extendable to secure a tubing in the groove, and a heater configured to heat the bend setting portion to a fixing temperature.

A system for imposing a permanent bend in a length of tubing, includes a bend setting portion having surface, a groove extending inwardly of the surface, the groove having a dimension which is smaller than an outer dimension of a tubing to be bent therein a fixing element extendable to secure a tubing in the groove, and a heater configured to heat the bend setting portion to a fixing temperature.

Repair device for a dent is provided in metal bend tube part of musical instrument capable of effectively performing repair work in short time, not by conventional repair method using dent ball. In the device, a pressurizing device main body is also provided formed by connecting base member having an L shape in side view with first fulcrum at a base thereof and movable pressurizing member whose upper surface has convex arc-shaped surface in side view and has a second fulcrum at center part of lower surface, through a first and second arm. A wire, passes through the second arm and upright part of base member in axial direction, is provided, stopper is fastened to an end of wire which has passed through to outside of second arm, and wire passes through inside of curved metal tube and other end side of wire is connected to a foot pressing device.

A processing apparatus of a trunk lid hinge arm includes a mandrel body extending in a longitudinal direction and configured to be insertable into an internal space of an extruded material, and a mandrel core fastened to a front end of the mandrel body, in which at least one surface of the mandrel core has a radius of curvature. The trunk lid hinge arm may comprise an aluminum alloy and comprise at least one bending part.

A processing apparatus of a trunk lid hinge arm includes a mandrel body extending in a longitudinal direction and configured to be insertable into an internal space of an extruded material, and a mandrel core fastened to a front end of the mandrel body, in which at least one surface of the mandrel core has a radius of curvature. The trunk lid hinge arm may comprise an aluminum alloy and comprise at least one bending part.