A method for manufacturing a multi-functional fastener includes a preparing operation, a forming operation and a threading operation. The preparing operation prepares a metal blank cut from a length of a metal material. The forming operation is executed so that the metal blank forms a shank, a head, and a drilling portion connected to the shank. The threading operation is executed to roll the metal blank with a thread rolling set having two opposite rolling plates. Each rolling plate has slit grooves and convex units arranged in alternation. Each of the convex units has protrusions each situated between two adjacent slit grooves, which allows the threading operation to equip the shank of the metal blank with thread convolutions, slots formed between the thread convolutions for helping quick removal of chips, and main ribs formed between any two adjacent slots for increasing cutting efficiency.

A method of manufacturing a drill comprises providing an elongate element defining a longitudinal direction and having, in the longitudinal direction, a front end, an intermediate section, and a rear end opposite to the front end; forming by cold forming only, at the front end, a drill tip having a cutting edge; and, forming by cold forming only, on the intermediate section, a channel extending along the longitudinal direction.

A tooling for cold forming operations can include a transition shoe and a die. The transition shoe can include a first dovetail formation and a second dovetail formation opposite the first dovetail formation relative to a pressing direction. The first dovetail formation can be configured to removably engage a dovetail formation on a shoe of a press. The die can include a third dovetail formation and a first cold forming profile. The third dovetail formation can be configured to removably engage the second dovetail formation on the transition shoe to removably secure the die to the press for cold forming operations.

A tooling for cold forming operations can include a transition shoe and a die. The transition shoe can include a first dovetail formation and a second dovetail formation opposite the first dovetail formation relative to a pressing direction. The first dovetail formation can be configured to removably engage a dovetail formation on a shoe of a press. The die can include a third dovetail formation and a first cold forming profile. The third dovetail formation can be configured to removably engage the second dovetail formation on the transition shoe to removably secure the die to the press for cold forming operations.

The invention relates to methods of stabilizing bone implants, comprising inserting a self tapping implant having at least two helical grooves running in opposite directions around the implant.

The present invention discloses a rolling-bulging forming hydraulic machine for tubular products, which includes a frame. The frame is provided with an upper rolling mechanism, a lower rolling mechanism, a fixed liquid bulging hydraulic cylinder and a movable liquid bulging hydraulic cylinder. The upper rolling mechanism and the lower rolling mechanism are arranged oppositely, and the upper rolling mechanism and the lower rolling mechanism are used to roll surfaces of a to-be-machined tubular product. The fixed liquid bulging hydraulic cylinder and the movable liquid bulging hydraulic cylinder are arranged oppositely, and the fixed liquid bulging hydraulic cylinder and the movable liquid bulging hydraulic cylinder are used to perform hydraulic bulging on the to-be-machined tubular product.

The die forming process includes first passing a circular coarse thread cutter over the forming surface of the die at an angle away from parallel to a side edge matching a pitch for coarse threads to be formed by the die. In a first cutting step, the coarse thread cutter forms upper portions of crests in the forming surface of the die. In a further step, a fine thread cutter is then utilized to cut portions of the root of the dual threaded die, leaving a bridge within the root. The fine thread cutter is angled relative to the crests formed in the first step. The fine thread cutter cuts at a variable depth as the fine thread cutter advances along the root between the crests to form two flanks on sides of the bridge within the root.

The die forming process includes first passing a circular coarse thread cutter over the forming surface of the die at an angle away from parallel to a side edge matching a pitch for coarse threads to be formed by the die. In a first cutting step, the coarse thread cutter forms upper portions of crests in the forming surface of the die. In a further step, a fine thread cutter is then utilized to cut portions of the root of the dual threaded die, leaving a bridge within the root. The fine thread cutter is angled relative to the crests formed in the first step. The fine thread cutter cuts at a variable depth as the fine thread cutter advances along the root between the crests to form two flanks on sides of the bridge within the root.

The present invention is a die positioning system for use in positioning mobile or fixed dies. The system includes a pair of key bars, a pair of key disc inserts, a set of key discs, and a set of disc backers. The key bars and key discs serve to offset manufacturing dies or die holders. Using key bars and/or key discs from different pairs of key bars and/or sets of key discs also allows for precise angulation of the dies or die holders. The key discs are held in place between the die and die holder, or between the die holder and key base, by the key disc inserts and angled (if feasible) by the disc backers. The key bars, located between the key disc inserts and the die or die holder allow additional offset of the die or die holder. The solid, stacked configuration of the key bars and key discs prevents the die or die holder from gradually or suddenly losing its positioning.

A method for forming a stop flange on a self-tapping screw includes locating a shank of a self-tapping screw between two threading dies, fixing one of the two threading dies and moving the other one of the two threading dies to work the shank, the external thread forming section of each of the threading dies performing threading to form an external thread on the shank, inserting the insert and the recessed corner of each of the threading dies into a top of the external thread to form a groove in the shank, and the insert of each of the threading dies gradually squeezing downward an extruded portion that is formed during formation of the groove to form a stop flange on the shank. Thus, the shank is integrally formed with the stop flange, to stop an excessive movement of the external thread.