The servo hot pressing machine achieves precise pressing through the synergy of hardware precision design, an intelligent control system, and process optimization. The following are the core technology paths and implementation methods:
1. Precision Guarantee of Hardware System
1) Servo motor drive system
High-precision power control:
Using direct-drive servo motors (such as Japanese Yaskawa and Panasonic brands), the positioning accuracy reaches ±0.01mm, and the repeatability accuracy is ±0.005mm.
The motor directly drives the pressure plate through a ball screw or linear guide to reduce the “soft connection” lag of the traditional hydraulic system (the response time of the hydraulic system is about 100ms, and the servo system is <20ms).
Pressure closed-loop control:
Built-in high-precision pressure sensor (accuracy ±0.1% FS), real-time feedback of pressure value to the controller, forming a “set value → motor output → pressure feedback → dynamic adjustment” closed loop, ensuring that the pressure fluctuation is ≤±1%.
2) Temperature control module
Multi-zone independent temperature control technology:
The heating platform adopts a ceramic heating plate + heat sink structure, with zone temperature control (3 zones, 5 zones, or custom zones), and the temperature difference between each zone is ≤±1℃.
Temperature control range: -20℃~450℃ (depending on the model configuration), the heating rate is adjustable from 0.1~20℃/s, and supports ramp heating and constant temperature maintenance multi-stage programs.
Real-time temperature monitoring:
Built-in K-type thermocouple or infrared thermometer, collects temperature data every 0.5 seconds, and dynamically adjusts power output through a PID algorithm.
3) Mechanical structure optimization
High rigidity frame design:
Use “C-type” or “gantry-type” integral casting frame (material HT300 cast iron), after aging treatment to eliminate internal stress, rigidity ≥ 200N/μm, reduce frame deformation during pressing (traditional hydraulic press deformation is about 0.1~0.3mm, servo model <0.05mm).
Low-friction kinematic pair:
The guide rail adopts THK linear guide rail or PMI precision screw, with automatic lubrication system (automatic oil supply at intervals of 5~30 minutes), friction coefficient ≤ 0.0015, to ensure smooth lifting and lowering of the pressure plate.
2. Precision Control of Intelligent Control Systems
1) Multi-axis linkage control algorithm
Pressure-displacement-temperature coupling control:
Through PLC or motion controller (such as Siemens S7-1500, Huichuan AM600), three-parameter synchronous control is realized:
Pressure priority mode: set the target pressure, and the displacement is automatically adjusted with the material compression (applicable to elastic materials).
Displacement priority mode: limits the pressing stroke, and the pressure is automatically matched with the contact force (applicable to rigid materials).
Mixed mode: segmented switching pressure-displacement control (such as fast displacement first, and then pressure maintenance).
Anti-overshoot algorithm:
When approaching the target pressure/displacement, it automatically switches to low-speed mode (5mm/s to 0.1mm/s). It cooperates with the dynamic braking function of the servo motor to avoid inertial shock (overshoot <0.5% of the set value).
2) Visualization and traceability of process parameters
Human-machine interface (HMI):
10~15-inch touch screen, supports multi-stage pressing program editing (such as up to 50 pressure-temperature-time combinations), and each parameter can be set independently (such as pressure 10~500kN, holding time 1~300s).
Real-time display of pressure-displacement-temperature curve, support for USB flash drive data export or docking with MES system, to achieve process traceability (data storage accuracy: pressure 0.1kN, temperature 0.1℃, time 1s).
3) Fault prediction and compensation mechanism
Dynamic compensation function:
If the pressure fluctuation exceeds ±3%, the system automatically triggers the compensation motor torque and restores the set value within 20ms (traditional hydraulic press compensation requires more than 500ms).
Abnormal alarm threshold:
You can customize the upper and lower limits of pressure/temperature (such as the upper limit of pressure 110% FS, the lower limit of temperature – 10℃), and the machine will automatically shut down and sound and light alarm when the limit is exceeded.
3. Coordinated optimization of mold and process
1) Precision processing and testing of the mold
Surface accuracy requirements:
The mold surface roughness Ra≤0.8μm, flatness ≤0.005mm/m, was tested by a three-coordinate measuring machine (CMM) to ensure uniform force during pressing.
Elastic buffer design:
The mold is equipped with a polyurethane buffer pad (hardness Shore 50~80A) or a pneumatic floating device to compensate for the material thickness tolerance (such as ±0.1mm) and avoid local overpressure.
The above are several ways to achieve precise pressing with servo hot hydraulic press machines. If you need a high-precision hot pressing machine, please contact us.
Post time: Jun-16-2025
