Intelligent numerically-controlled pressure system for reciprocating extrusion and method of operating the same

Abstract

An intelligent numerically-controlled pressure system for reciprocating extrusion, including a mold clamping and temperature control unit, a displacement control unit, a base, a personal computer (PC), and a temperature-displacement sensing and control unit. The temperature-displacement-sensing and control unit is oriented toward a mold. The PC is communicatively connected to the mold clamping and temperature control unit, the displacement control unit, a mold control platform and the temperature-displacement sensing and control unit. An autonomous leveling mechanism is provided in the mold control platform, and is communicatively connected to the displacement control unit. A method of operating such pressure system is also provided.

What is claimed is: 
     
         1 . An intelligent numerically-controlled pressure system for reciprocating extrusion, comprising:
 a mold clamping and temperature control unit;   a displacement control unit;   a base;   a personal computer (PC); and   a temperature-displacement sensing and control unit;   wherein the displacement control unit comprises a sliding rod; the base is provided with a sliding groove; the sliding rod is arranged in the sliding groove; the sliding rod is provided with an electric lifting mechanism; and the electric lifting mechanism is fixedly provided with a mold control platform;   the mold clamping and temperature control unit comprises two moving rods arranged opposite to each other; and each of the two moving rods is provided with an electric translation mechanism;   the mold control platform is provided with a mounting groove; the two moving rods are arranged in the mounting groove; each of the two moving rods is further provided with a clamp for fixing a mold; and the clamp is provided with a temperature control mechanism and a pressure sensor;   the temperature-displacement sensing and control unit is oriented toward the mold;   the PC is communicatively connected to the mold clamping and temperature control unit, the displacement control unit, the mold control platform and the temperature-displacement sensing and control unit; and   an autonomous leveling mechanism is provided in the mold control platform; and the autonomous leveling mechanism is communicatively connected to the displacement control unit; and   the intelligent numerically-controlled pressure system is configured to be operated through steps of:   (S1) setting a displacement parameter of the mold control platform in the PC; and raising or lowering, by the displacement control unit, the mold control platform to a predetermined height and subsequently moving the mold control platform forward according to the displacement parameter of the mold control platform, such that the mold control platform extends out of the base to a first designated position;   (S2) placing the mold on an upper surface of the mold control platform; setting a mold clamping parameter in the PC; and raising or lowering, by the mold clamping and temperature control unit, the clamp to a second designated position according to a mold clamping position, and applying, by the clamp, a clamping force to the mold;   (S3) setting a displacement parameter of the mold control platform in the PC;   adjusting, by the displacement control unit, the mold control platform to a third designated position based on the displacement parameter of the mold control platform, such that a press head is aligned with the mold; and leveling the mold control platform through the autonomous leveling mechanism;   (S4) measuring an extrusion reduction through the temperature-displacement sensing and control unit; feeding a measured extrusion reduction back to the PC; and setting, by the PC, a reference reduction according to the measured extrusion reduction; and   (S5) setting an extrusion speed, an extrusion temperature and an extrusion pressure in the PC; and heating the mode to the extrusion temperature with the temperature control mechanism of the clamp;   maintaining the mold at the set extrusion temperature under a constant power; and   regulating a pressure during an extrusion process according to the extrusion pressure set in the PC followed by extrusion.   
     
     
         2 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the base is further provided with a pressure monitoring unit; and the pressure monitoring unit is electrically connected to the pressure sensor of the clamp. 
     
     
         3 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the autonomous leveling mechanism is a gyroscope-based leveling mechanism. 
     
     
         4 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the PC is provided with a radio frequency transceiver. 
     
     
         5 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the number of the sliding groove is two; and the number of the sliding rod is two. 
     
     
         6 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the temperature-displacement sensing and control unit comprises an infrared distance sensor connected to a thermocouple. 
     
     
         7 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the electric lifting mechanism comprises a ring part sleeved on the mold control platform; and the ring part is provided with a roller and a motor drive device. 
     
     
         8 . The intelligent numerically-controlled pressure system of  claim 1 , wherein the electric lifting mechanism comprises an electric lifting rod provided on the sliding rod. 
     
     
         9 . The intelligent numerically-controlled pressure system of  claim 1 , wherein leveling parameters of the autonomous leveling mechanism comprise a leveling time of less than 180 s, an operating time required for a leveling accuracy, and a stable state maintaining period of 24 h, wherein the operating time is less than 2 min; a heating temperature of the mold clamping and temperature control unit is 50-500° C.; and the extrusion speed is 0.001-100 mm/s.