The green sand molding machine mainly ensures the dimensional accuracy and geometric tolerance stability of metal castings through three core paths: uniform sand mold compaction, precise control of molding sand properties, and high-precision control of mechanical movements.
Uniform Sand Mold Compaction Control
- Composite compaction process
Adopt the combination of sand shooting and micro-vibration compaction. Driven by 0.58MPa working air pressure, the vibration mechanism generates a 650kg vertical impact force. With segmented pressure adjustment of multi-contact heads, different specific pressures (up to 4.0kg/cm²) are applied to different areas of the sand mold, making sand grains rearrange to eliminate internal voids and improving the uniformity of sand mold density by more than 30%. - Parting process adaptation
For mass-produced small and medium-sized parts, the vertical parting scheme is preferred to minimize the compaction deviation; for complex castings, the horizontal parting structure is selected, and the vertical sand shooting direction ensures complete sand filling around the pattern, avoiding local looseness that causes casting deformation. - Gradient compaction design
For castings with deep cavities and complex shapes, the equipment can adjust the compaction stroke and vibration frequency to achieve a gradient distribution of compaction from the parting surface to the bottom of the mold, which not only ensures the hardness of the mold cavity surface but also avoids pouring expansion caused by insufficient overall rigidity of the sand mold.
Dynamic and Precise Control of Molding Sand Properties
- On-line parameter monitoring
Integrated with a molding sand quality control system, it detects core indicators such as sand temperature, moisture content, compactibility, and wet compressive strength in real time, stabilizing the compactibility at 30%~40% and the wet compressive strength at 0.15~0.17MPa, avoiding sand mold cracking and sand sticking defects caused by molding sand performance fluctuations. - Quantitative addition of auxiliary materials
In the mixing stage of reclaimed sand, additives such as bentonite and coal powder are accurately released. Through the closed-loop control of mechanical sampling and pneumatic measurement, the moisture fluctuation of molding sand is controlled within ±0.2%, ensuring consistent fluidity and plasticity of each batch of molding sand. - Reclaimed sand regeneration treatment
Equipped with sand cooling, screening and impurity removal modules, the temperature of reclaimed sand is controlled within the process requirements, metal debris and inert dust in the sand are removed, and the mud content of molding sand is maintained in the reasonable range of 10%~13%, eliminating precision-damaging defects such as casting pores and sand holes from the material end.
High-precision Execution of Mechanical Movements
- Precision control of mold stripping and mold clamping
Adopt a large-stroke high-precision mold stripping cylinder (such as 300mm stroke), and cooperate with a servo hydraulic drive system to make the mold stripping speed stable and controllable, avoiding scratches and chipping of the sand mold cavity during mold stripping; during mold clamping, through rigid positioning pins and fixtures, the misalignment deviation of the upper and lower sand molds is controlled within 0.1mm, greatly reducing the flash on the parting surface. - Automatic process closed loop
The full-automatic molding machine is precisely controlled by the program from sand filling, compaction, mold stripping to mold closing, eliminating the quality fluctuation caused by manual operation, and stably producing hundreds of high-precision sand molds per hour. The dimensional tolerance of castings can stably reach CT8~CT9 level. - Modular adaptive design
It supports customizing the flask size and pressure parameters according to the casting size, adapting to different production needs from engine blocks to small hydraulic parts. Through the IoT module, production data is collected in real time, process parameters are dynamically adjusted, and the sand mold preparation is upgraded from experience-driven to data-driven.
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 Green Sand Molding Machine, you can contact us through the following contact information:
Sales Manager: zoe
E-mail: zoe@junengmachine.com
Telephone: +86 13030998585
Post time: Nov-09-2026