Flaskless Molding Machine: A Modern Foundry Equipment
The flaskless molding machine is a contemporary foundry device primarily used for sand mold production, characterized by high production efficiency and simple operation. Below, I will detail its workflow and main features.
I. Basic Working Principle of Flaskless Molding Machines
Flaskless molding machines utilize front and rear compression plates to squeeze molding sand into shape, completing the molding process without the need for traditional flask support. Their core technical features include:
Vertical Parting Structure: Employs a shooting and pressing method to simultaneously create upper and lower sand molds. This double-sided mold reduces the sand-to-metal ratio to 30%-50% compared to single-sided structures.
Horizontal Parting Process: Sand filling and compaction occur within the mold cavity. Hydraulic/pneumatic drives achieve mold shell compression and pressure-maintained demolding.
Shooting and Pressing Compaction Method: Uses a combined shooting and pressing technique to compact the sand, resulting in mold blocks with high and uniform density.
II. Main Workflow of Flaskless Molding Machines
Sand Filling Stage:
The sand frame height is set according to the formula: H_f = H_t × 1.5 – H_b, where H_f is the sand frame height, H_t is the target mold height, and H_b is the drag box height.
Typical Parameter Configuration:
Drag Box Height: 60-70mm (Standard Range: 50-80mm)
Sand Inlet on Sand Frame Sidewall: Positioned at 60% of the height
Compaction Pressure: 0.4-0.7 MPa
Shooting and Pressing Molding Stage:
Employs top and bottom shooting technology, ensuring complete, void-free sand filling. This is suitable for castings with complex shapes and significant protrusions/recesses.
Both sides of the mold block feature mold cavities. The complete casting mold is formed by the cavity between two opposing blocks, with a vertical parting plane.
Continuously produced mold blocks are pushed together, forming a long string of molds.
Mold Closing and Pouring Stage:
The gating system is located on the vertical parting face. As the blocks push against each other, when pouring occurs within the middle of the mold string, the friction between several blocks and the pouring platform can withstand the pouring pressure.
The upper and lower boxes always slide on the same set of guide rods, ensuring precise mold closing alignment.
Demolding Stage:
Hydraulic/pneumatic drives achieve shell compression and pressure-maintained demolding.
Features a conveniently designed core-setting station. The drag box does not need to slide or rotate out, and the absence of obstructing pillars facilitates easy core placement.
III. Operational Characteristics of Flaskless Molding Machines
High Production Efficiency: For small castings, production rates can exceed 300 molds/hour. Specific equipment efficiency is 26-30 seconds per mold (excluding core-setting time).
Simple Operation: Features a one-button operation design, requiring no specialized technical skills.
High Level of Automation/Intelligence: Equipped with fault display functions, making it easy to diagnose machine abnormalities and downtime causes.
Compact Structure: Single-station operation. Processes from molding to core setting, mold closing, flask removal, and mold ejection are all completed at one station.
IV. Application Advantages of Flaskless Molding Machines
Space Saving: Eliminates the need for traditional flask support, resulting in a smaller equipment footprint.
Energy Efficient & Eco-friendly: Operates entirely pneumatically, requiring only a stable air supply, resulting in low overall power consumption.
Strong Adaptability: Suitable for efficient, high-volume production of small to medium-sized castings, both cored and uncored, in the cast iron, cast steel, and non-ferrous metal casting industries.
Fast Return on Investment (ROI): Offers advantages such as low investment, quick results, and reduced labor requirements.
Leveraging its efficiency, precision, and automation, the flaskless molding machine has become vital equipment in the modern foundry industry, particularly well-suited for high-volume production of small and medium-sized castings.
Quanzhou Juneng Machinery Co.,Ltd. is a subsidiary of Shengda Machinery Co.,Ltd. specializing in casting equipment.A high-tech R&D enterprise that has long been engaged in the development and production of casting equipment, automatic molding machines,and casting assembly lines.
If you need a Flaskless molding machine, you can contact us through the following contact information:
Sales Manager : zoe
E-mail : zoe@junengmachine.com
Telephone : +86 13030998585
Post time: Oct-29-2025