Baijun Machinery specializes in hot pressing equipment, precision stamping equipment, and powder forming equipment.
(National High-Tech Enterprise)
Product Description
Automatic Hydraulic Press for Magnetic Materials
1. Overview of the Magnetic Material Press:
The fully automatic magnetic material forming hydraulic press is primarily designed for the mass production of high-performance rare-earth bonded permanent magnet products through compression molding. It is also the ideal molding equipment for a wide range of precision powder components. The main unit features a high-precision rail-frame structure with a floating cavity design, paired with synchronized upper and lower hydraulic cylinder systems.
This machine boasts a compact layout, a low center of gravity, and exceptional stability, rigidity, and precision. A standout feature of its hydraulic system is that, during the pressing process, the lower cylinder only begins to move after the upper cylinder reaches a predetermined pressing force—enabling bidirectional compression. This unique mechanism ensures uniform product density, resulting in high-performance magnets. Additionally, the press incorporates a protective demolding function.
Fully Automatic Magnetic Material Press Servo Energy-Saving Upgrade Solution
2. Machine Components:
1: Host:
(1) Featuring a high-precision rail-frame design, equipped with a main cylinder, lower cylinder, fluid charging unit, and upper limit device.
Including the lower limit device, etc. The workbench features a wide surface area, allowing for the installation of various types of multi-cavity molds.
(2) Both the upper and lower cylinders feature integral forged cylinder barrels.
(3) The piston rods of the machine cylinders all undergo surface heat treatment followed by hard-chromium plating.
2: Hydraulic System:
(1) Utilizing an imported proportional control system, the pressing speed can be automatically adjusted continuously and at multiple points based on the slurry’s dewatering performance and the characteristics of the pressed product, thereby enhancing the dynamic response during pressure transitions and ensuring both stable pressing speed and uniformity of pressing pressure.
(2) Utilizes a combination of high- and low-pressure oil pumps for oil supply, ensuring rational allocation of oil sources based on the pressing process, thereby minimizing system heat generation and eliminating the adverse effects of excess oil supply.
(3) The use of a plate-type integrated oil circuit system reduces leakage and makes adjustments and maintenance more convenient.
(4) Clamping force, ejector force (floating pressure in the lower cylinder), injection force, and mold-release protection force are all continuously adjustable.
(5) Features both standard demolding and protective demolding functions.
(6) Install the mold-pulling safety protection valve.
(7) Centralized oil return system equipped with a cooling device. Ensure the machine operates at normal temperatures.
3: Electric Control System:
(1) Utilizing internationally popular AI artificial intelligence control technology.
(2) Utilizes a PLC programmable logic controller for centralized control
(3) Utilize a human-machine interface touch screen to set and adjust various process operations and parameters—including mold clamping pressure, holding pressure, pressing speed, mold closing delay, material injection delay, holding pressure delay, pressure release delay, demagnetization delay, demolding method, mold cavity height, process curves, alarm display, press operation status display, fault descriptions, and operating instructions, among others.
(4) The device uses a displacement sensor for control, enabling automatic detection of the lower cylinder stroke. It also allows precise adjustment of the mold cavity and real-time monitoring of the pressing process directly from the human-machine interface.
(5) The PLC programmable controller, human-machine interface, and other key components are all original imported parts.
4. Magnetizing Coil Assembly: Stainless steel housing, water-cooled, capable of handling a high current of 500 amps with a total ampere-turn rating of 50,000.
5. Feed Mixing and Water Absorption System: Composed of a feeding cylinder, feed valve, mixing drum, vacuum pump, air storage tank, and more, the entire system is integrated into a single assembly. Both the hydraulically controlled feed valve and the composite feed cylinder feature the latest design innovations, ensuring high sealing performance and minimizing moisture content in the slurry. This not only reduces equipment maintenance needs but also enhances production efficiency.
6. Process Actions: The machine offers two process operation modes—manual and semi-automatic cycle. In manual mode, pressing the corresponding button initiates the desired process action, ideal for adjusting the machine or installing molds. In semi-automatic mode, pressing both hand buttons automatically triggers a complete process cycle. The semi-automatic protection cycle for demolding and pressing includes the following steps: lower cylinder ejects—slider rapidly descends—slider slows down—mold closes—automatic material injection—pressing at Speed 1—pressing at Speed 2—pressing at Speed 3—pressing at Speed 4—holding pressure (automatic material suction)—pressure relief (demagnetization)—lower cylinder retracts—upper cylinder returns—part removal and mold cleaning.
3. Introduction to the Electro-Hydraulic Proportional Control System for Magnetic Material Press Machines
(1) Oil Source Control: The oil source is equipped with a piston pump featuring a displacement of 10 ml/r and another pump with a displacement of
A 40 ml/r vane pump is configured to deliver low-to-high flow rates combined with high-to-low pressure outputs, driven simultaneously by the front and rear shafts of a single 7.5 kW, three-phase, four-pole motor. During different process stages, the output pressure is precisely controlled via a proportional overflow valve programmed to adapt to varying operational conditions.
(2) Upper Die Cylinder Control: By using a combination of a filling valve and proportional directional valves, the system can achieve various process speed requirements, including fast advance, slow advance, working advance, and fast return. A proportional overflow valve ensures smooth pressure relief in the rodless chamber, preventing pressure surges caused by on-off relief methods that could lead to cracking in the workpiece. Additionally, another proportional valve controls the backpressure in the lower cavity of the upper die cylinder, coordinating seamlessly with the fast advance, slow advance, and working advance stages to maintain balanced die movement and significantly enhance the quality of the machined parts.
(3) Lower die cylinder control: Controlled via a proportional directional valve program to achieve variable speeds, meeting the requirements for fast upward movement, rapid downward action, floating pressing, and die removal processes. A safety valve protects the lower die mold from being damaged by external forces.
(4) Core mold cylinder control is managed via another proportional directional valve program, enabling the adjustment of varying speeds to meet the requirements of fast upward movement, rapid downward descent, and efficient core mold removal. A safety valve protects the core mold from being damaged by unintended external forces.
The aforementioned proportional components, adjusted via a proportional ramp time, allow precise control over the transition periods for speed and pressure switching in each process step. This ensures smooth hydraulic cylinder movement, minimizes system pressure surges, and provides stable loading, all of which contribute to efficient and high-quality workpiece compression molding.
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Mobile: 180-2225-3860(Mr. Guan)
Email: 1961666888@qq.com
add: No. 8, Self-compiled Building, Baidouli Factory, Industrial Zone, Shuaibian Economic Cooperative, Laobian Community, Danzao Town, Foshan City, Guangdong Province
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