A turning and thread-rolling machine with a pre-compression device, comprising:
- a fixing base having a bottom side fixed on a flat surface;
- the pre-compression device comprising:
- a pre-compression structure provided on the fixing base at a position adjacent to a front end of the fixing base, wherein the pre-compression structure is penetrated by a cold-rolling opening that opens at both a front end and a rear end of the pre-compression structure, the pre-compression structure is formed with at least two mounting grooves that extend in a radial direction of the pre-compression structure and are equally angularly spaced from each other, each said mounting groove has a first end exposed on an outer periphery of the pre-compression structure and an opposite second end in communication with the cold-rolling opening, and each said mounting groove has a wall provided with a guiding portion;
- a carrier fixedly provided on the pre-compression structure and exposed in the cold-rolling opening, wherein the carrier has at top portion formed with a carrying groove;
- and
- at least two driving devices mounted in the mounting grooves respectively, wherein each said driving device has an end provided with a cold-rolling head and is configured to push the cold-rolling head along a corresponding one of the guiding portions so that the cold-rolling head is displaced toward a center of the cold-rolling opening, each said cold-rolling head is formed with a forming groove, contours of the forming grooves and a contour of the carrying groove are able to join together to form a compression space therebetween, and the compression space has a smaller diameter than an unprocessed reinforcing bar;
- a fixing mechanism locked on the fixing base at a position corresponding to a rear end of the pre-compression device, wherein the fixing mechanism is provided with two clamping jaws;
- a guiding base having a bottom side locked on the fixing base at a position corresponding to a rear end of the fixing mechanism, wherein the guiding base is provided with a transverse translation mechanism and a longitudinal translation mechanism;
- a processing mechanism assembly locked on a top side of the guiding base and transversely provided with a starting mechanism, a turning mechanism, and a thread-rolling mechanism, wherein the starting mechanism has a front end provided with a position detection rod;
- and
- a control unit separately and electrically connected to the pre-compression device, the fixing mechanism, the transverse translation mechanism, the longitudinal translation mechanism, and the processing mechanism assembly, wherein when a portion of the unprocessed reinforcing bar that is adjacent to an end thereof extends into the cold-rolling opening and is placed on a wall of the carrying groove, the control unit drives the driving devices to displace the cold-rolling heads simultaneously toward the center of the cold-rolling opening, in order for the cold-rolling heads and the carrier to apply pressure to the unprocessed reinforcing bar and thereby form both a pre-compressed annular groove in the portion of the unprocessed reinforcing bar that is adjacent to the end thereof and a to-be-processed portion between the end of the unprocessed reinforcing bar and the pre-compressed annular groove;
- and when the end of the unprocessed reinforcing bar further extends into a space above the guiding base and is pressed against the position detection rod, the control unit drives the fixing mechanism to clamp a middle section of the unprocessed reinforcing bar and also drives the transverse translation mechanism and the longitudinal translation mechanism so that the turning mechanism and the thread-rolling mechanism are sequentially displaced to a position corresponding to the to-be-processed portion to perform turning and thread rolling respectively, thereby processing the to-be-processed portion into a coupling end.